Zhukova, Y., Petrov, P., Demikhov, Y., Mason, A. and Korostynska, O. (2017) “Milk Urea Content and δ13C as Potential Tool for Differentiation of Milk from Organic and Conventional Low- and High-Input Farming Systems”, Turkish Journal of Agriculture - Food Science and Technology, 5(9), pp. 1044–1050. doi: 10.24925/turjaf.v5i9.1044-1050.1286.