Anderson James E, van Wincoop Eric (2003): Gravity with Gravitas: A Solution to the Border Puzzle. American Economic Review, 93, 170-192  https://doi.org/10.1257/000282803321455214 Bao X., Qiu L.D. (2010): Do technical barriers to trade promote or restrict trade? Evidence from China. Asia-Pacific Journal of Accounting & Economics, 17: 253–280. Bao X., Qiu L.D. (2012): How Do technical barriers to trade influence trade? Review of International Economics, 20: 691–706.Burger Martijn, van Oort Frank, Linders Gert-Jan (2009): On the Specification of the Gravity Model of Trade: Zeros, Excess Zeros and Zero-inflated Estimation. Spatial Economic Analysis, 4, 167-190  https://doi.org/10.1080/17421770902834327 Cerra V., Saxena S.C. (2003): How responsive is Chinese export supply to market signals? China Economic Review, 14: 350–370.Chen Chunlai, Yang Jun, Findlay Christopher (2008): Measuring the Effect of Food Safety Standards on China’s Agricultural Exports. Review of World Economics, 144, 83-106  https://doi.org/10.1007/s10290-008-0138-zChevassus-Lozza Emmanuelle, Latouche Karine, Majkovič Darja, Unguru Manuela (2008): The importance of EU-15 borders for CEECs agri-food exports: The role of tariffs and non-tariff measures in the pre-accession period. Food Policy, 33, 595-606  https://doi.org/10.1016/j.foodpol.2008.07.005de Frahan B. H. (2006): Harmonisation of food regulations and trade in the Single Market: evidence from disaggregated data. European Review of Agricultural Economics, 33, 337-360  https://doi.org/10.1093/eurrag/jbl015Disdier A. C., Marette S. (): The Combination of Gravity and Welfare Approaches for Evaluating Nontariff Measures. American Journal of Agricultural Economics, 92, 713-726  https://doi.org/10.1093/ajae/aaq026Disdier Anne-Célia, Fontagné Lionel, Mimouni Mondher (2008): The Impact of Regulations on Agricultural Trade: Evidence from the SPS and TBT Agreements. American Journal of Agricultural Economics, 90, 336-350  https://doi.org/10.1111/j.1467-8276.2007.01127.x Drogué S., Demaria F. (2012): Pesticide residues and trade, the apple of discord? Food Policy, 37: 641–649. Flam H., Nordström H. (2011): Gravity Estimation of the Intensive and Extensive Margins of Trade: An Alternative Procedure with Alternative Data Institute for International Economic Studies, Stockholm University, and CESifo.Feenstra Robert C. (2002): Border Effects and the Gravity Equation: Consistent Methods for Estimation. Scottish Journal of Political Economy, 49, 491-506  https://doi.org/10.1111/1467-9485.00244 Ferrantino M. (2006): Quantifying the trade and economic effects of non-tariff measures, OECD, Paris. Fontagne L., Mimouni M., Pasteels J.M. (2005): Estimating the impact of environmental SPS and TBT on international trade. Integration and Trade, 22: 7–37. Gao L., Thornsbury S. (2008): Increasing food-safety protection: Fresh apple markets in China. Journal of Food Distribution Research, 39: 72–77.Haq Zahoor, Meilke Karl (2009): The Role of Income in Trading-Differentiated Agri-Food Products: The Case of Canada, the United States, and Selected EU Countries. Canadian Journal of Agricultural Economics/Revue canadienne d'agroeconomie, 57, 343-363  https://doi.org/10.1111/j.1744-7976.2009.01155.x Head K., Mayer T. (2014): Gravity equations: Workhorse, toolkit, and cookbook. In: Gopinath G., Helpman E., Rogoff K. (eds.): Handbook of International Economics. Vol. 4, North-Holland Elsevier, Amsterdam.Henson Spencer, Jaffee Steven (2008): Understanding Developing Country Strategic Responses to the Enhancement of Food Safety Standards. The World Economy, 31, 548-568  https://doi.org/10.1111/j.1467-9701.2007.01034.xIsard Walter (1954): Location Theory and Trade Theory: Short-Run Analysis. The Quarterly Journal of Economics, 68, 305-  https://doi.org/10.2307/1884452 Ishaq M., Li C., Ping Q. (2014): Food safety issues in China: an insight into the dairy sector. Journal of Animal and Veterinary Advances, 13: 719–727.Jayasinghe Sampath, Beghin John C., Moschini GianCarlo (): Determinants of World Demand for U.S. Corn Seeds: The Role of Trade Costs. American Journal of Agricultural Economics, 92, 999-1010  https://doi.org/10.1093/ajae/aaq056Jongwanich Juthathip (2009): The impact of food safety standards on processed food exports from developing countries. Food Policy, 34, 447-457  https://doi.org/10.1016/j.foodpol.2009.05.004 Korinek J., Melatos M., Rau M.-L. (2008): A review of methods for quantifying the trade effects of standards in the agri-food sector. OECD, Paris.Li Yuan, Beghin John C. (2012): A meta-analysis of estimates of the impact of technical barriers to trade. Journal of Policy Modeling, 34, 497-511  https://doi.org/10.1016/j.jpolmod.2011.11.001Li Yuan, Beghin John C. (2014): Protectionism indices for non-tariff measures: An application to maximum residue levels. Food Policy, 45, 57-68  https://doi.org/10.1016/j.foodpol.2013.12.005 Li Y., Xiong B., Beghin J.C. (2014): The Political Economy of Food Standard Determination: International Evidence from Maximum Residue Limits.Working Paper No. 13011, Iowa State University, Department of Economics, Ames,Iowa,50011–1070. Martin W., Pham C. (2015): Estimating the gravity model when zero trade flows are frequent and economically determined. Policy Research Working Paper, World Bank, Washington DC.Melo Oscar, Engler Alejandra, Nahuehual Laura, Cofre Gabriela, Barrena José (2014): Do Sanitary, Phytosanitary, and Quality-related Standards Affect International Trade? Evidence from Chilean Fruit Exports. World Development, 54, 350-359  https://doi.org/10.1016/j.worlddev.2013.10.005 Moenius J. (2004): Information versus product adaptation: the role of standards in trade. IBMRC Working Paper, Northwestern University, Evanston. Moenius J. (2006): The Good, the Bad and the Ambiguous: Standards and Trade in Agricultural Products. In: IATRC Summer Symposium, May 28–30, Bonn.Neeliah Shalini A., Neeliah Harris, Goburdhun Daya (2013): Assessing the relevance of EU SPS measures to the food export sector: Evidence from a developing agro-food exporting country. Food Policy, 41, 53-62  https://doi.org/10.1016/j.foodpol.2013.04.002 Ortega D.L., Wang H.H., Wu L. (2009): Food safety and demand: Consumer preference for imported pork in urban China. Journal of Food Distribution Research, 40: 52–63. Otsuki T., Wilson J., Sewadeh M. (2001a): Saving two in a billion: Quantifying the trade effect of European food safety standards on African exports. Food Policy, 26: 495–514. Otsuki T., Wilson J., Sewadeh M. (2001b): What price precaution? European harmonization of aflatoxin regulations and African groundnuts exports. European Review of Agricultural Economics, 28: 263–283.Ravenstein E. G. (1885): The Laws of Migration. Journal of the Statistical Society of London, 48, 167-  https://doi.org/10.2307/2979181Silva J. M. C. Santos, Tenreyro Silvana (2006): The Log of Gravity. Review of Economics and Statistics, 88, 641-658  https://doi.org/10.1162/rest.88.4.641Song Haiying, Chen Kevin (2010): Trade Effects and Compliance Costs of Food Safety Regulations: the Case of China. Agriculture and Agricultural Science Procedia, 1, 429-438  https://doi.org/10.1016/j.aaspro.2010.09.054Sun Dingqiang, Huang Jikun, Yang Jun (2014): Do China's food safety standards affect agricultural trade? The case of dairy products. China Agricultural Economic Review, 6, 21-37  https://doi.org/10.1108/CAER-06-2012-0062VIGANI MAURO, RAIMONDI VALENTINA, OLPER ALESSANDRO (2012): International trade and endogenous standards: the case of GMO regulations. World Trade Review, 11, 415-437  https://doi.org/10.1017/S1474745612000262Wilson John S., Otsuki Tsunehiro (2003): Food Safety and Trade: Winners and Losers in a Non-Harmonized World. Journal of Economic Integration, 18, 266-287  https://doi.org/10.11130/jei.2003.18.2.266Wilson John S., Otsuki Tsunehiro (2004): To spray or not to spray: pesticides, banana exports, and food safety. Food Policy, 29, 131-146  https://doi.org/10.1016/j.foodpol.2004.02.003Xin Xian, Liu Jing (2008): Geographic Concentration and China's Agricultural Export Instability. The World Economy, 31, 275-285  https://doi.org/10.1111/j.1467-9701.2007.01069.x Xiong B., Beghin J. (2012): Does European aflatoxin regulation hurt groundnut exporters from Africa? European Review of Agricultural Economics, 39: 589–609.Yu Wusheng, Frandsen Soren E. (2005): China's WTO Commitments in Agriculture and Impacts of Potential OECD Agricultural Trade Liberalizations*. Asian Economic Journal, 19, 1-28  https://doi.org/10.1111/j.1467-8381.2005.00202.x