SYROVÁTKA, Pavel. Income elasticity of demand within individual consumer groups and the level of income elasticity of the entire market demand. In Agricultural economics : an international journal = mezinárodní vědecký časopis. - Prague : Institute of Agricultural and Food Information, 2006. ISSN 0139-570X, 2006, vol. 52, no. 9, s. 412-417. Dostupné na : <http://www.agriculturejournals.cz/publicFiles/58055.pdf>