1. [1] Asparuhova, I. Economic-mathematical modelling of agricultural production. Svishtov: Publishing house"Tsenov", 1999
2. [2] Kacharmazov. Economic-mathematical modelling of the feeding of non-ruminant animals - methodological and educational-cognitive dimensions. Vocational Training, year XV, booklet 1, 2013
3. [ 3] Ordinance No. 23/19.07.2005 of the Ministry of Healthcare, Determines the physiological norms for the feeding of the population in the Republic of Bulgaria.
4. [4] National recommendations for healthy diet of the population in Bulgaria. National Center of Public Health and Analyses ISBN9526
5. [5] Nestorova, V., Hygiene of nutrition and food legislation. MATKOM, 2014