PINTAR, Marjeta; ZAGORC, Barbara. Impact of nitrogen fertilisation on the economic efficiency of winter wheat yield. Economics of Agriculture, [S.l.], v. 57, n. Spec.num.2, p. 243-250, dec. 2010. ISSN 2334-8453. Available at: <http://ea.bg.ac.rs/index.php/EA/article/view/997>. Date accessed: 25 oct. 2020.