Mierzejewski, M., & Lampart, M. (2018). Analysis of Business Cycles in the Breeding of Pigs, Cattle and Poultry and their Relationship to the Causality of Wheat and Rye Cultivation in Poland. Zeszyty Naukowe SGGW W Warszawie - Problemy Rolnictwa Światowego, 18(2), 218–227. https://doi.org/10.22630/PRS.2018.18.2.49