@article{NSJOM_1981_11_Nonea_27,
     author = {{\CYRT}{\cyro}{\cyrsh}{\cyri}{\cyrch} {\CYRR}{\cyra}{\cyrt}{\cyrk}{\cyro}},
     title = {{\CYRT}{\cyri}{\cyrp}{\cyra} {\cyrb}{\cyra}{\cyrz}{\cyri}{\cyrs}{\cyro}{\cyrv} {\cyrd}{\cyrl}{\cyrya} 

 {\cyro}{\cyrd}{\cyrn}{\cyro}{\cyrishrt} 

 {\cyrm}{\cyro}{\cyrd}{\cyri}{\cyrf}{\cyri}{\cyrk}{\cyra}{\cyrc}{\cyri}{\cyri} {\cyra}{\cyrl}{\cyrg}{\cyre}{\cyrb}{\cyrr}{\cyrery} 

 {\cyrl}{\cyro}{\cyrg}{\cyri}{\cyrk}{\cyri}},
     journal = {Novi Sad Journal of Mathematics},
     pages = {287-295},
     publisher = {mathdoc},
     volume = {11},
     year = {1981},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1981_11_Nonea_27/}
}