ŠKORECOVÁ, Emília - FARKAŠOVÁ, Mária. Variant calculation - the instrument of economic performance management of a multifunctional agricultural enterprise. In Agricultural economics. - Prague : Institute of Agricultural and Food Information, 2008. ISSN 0139-570X, 2008, vol. 54, no. 8, s. 376-383. Dostupné na : <http://www.agriculturejournals.cz/publicFiles/01944.pdf>