Andreyeva, T., Brownell, K.D., Long, M.W. (2010). The Impact of Food Prices Consumption: A Systematic Review of Research on the Price Elasticity of Demand for Food. AM J Public Health 100(2): 216-222 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2804646/ (17.02.2020)