STEVIČ, Stevo, Bratislav IRIČANIN a Zdeněk ŠMARDA. On a close to symmetric system of difference equations of second order. Advances in Difference Equations [online]. Springer Nature, 2015, 2015(264), 1-17 [cit. 2023-03-21]. ISSN 1687-1847. Dostupné z: doi:10.1186/s13662-015-0591-7