@article{NSJOM_1982_12_Nonea_29,
     author = {{\CYRYA}{\cyra}{\cyrn}{\cyre}{\cyrz} 

 {\CYRU}{\cyrsh}{\cyra}{\cyrn}},
     title = {{\CYRO} {\cyro}{\cyrd}{\cyrn}{\cyro}{\cyrm} 

 {\cyrk}{\cyrl}{\cyra}{\cyrs}{\cyre} {\cyrk}{\cyro}{\cyrn}{\cyre}{\cyrch}{\cyrn}{\cyrery}{\cyrh}

 k-{\cyrp}{\cyro}{\cyrl}{\cyru}{\cyrs}{\cyre}{\cyrt}{\cyre}{\cyrishrt}},
     journal = {Novi Sad Journal of Mathematics},
     pages = {387-398},
     publisher = {mathdoc},
     volume = {12},
     year = {1982},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1982_12_Nonea_29/}
}