@article{NSJOM_1985_15_2a_12,
     author = {{\CYRYA}{\cyra}{\cyrn}{\cyre}{\cyrz} 

 {\CYRU}{\cyrsh}{\cyra}{\cyrn}},
     title = {{\CYRO}{\cyrb} 

 {\cyro}{\cyrt}{\cyrn}{\cyro}{\cyrsh}{\cyre}{\cyrn}{\cyri}{\cyrya}{\cyrh} 

 {\cyrp}{\cyra}{\cyrr}{\cyra}{\cyrl}{\cyrl}{\cyre}{\cyrl}{\cyrsftsn}{\cyrn}{\cyro}{\cyrs}{\cyrt}{\cyri} 

 {\cyrv} {\cyrk}-{\cyrp}{\cyro}{\cyrl}{\cyru}{\cyrs}{\cyre}{\cyrt}{\cyrya}{\cyrh}},
     journal = {Novi Sad Journal of Mathematics},
     pages = {155-161},
     publisher = {mathdoc},
     volume = {15},
     number = {2},
     year = {1985},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1985_15_2a_12/}
}