@article{NSJOM_1989_19_2a_12,
     author = {{\CYRU}{\cyrsh}{\cyra}{\cyrn} 

 {\CYRYA}{\cyra}{\cyrn}{\cyre}{\cyrz}},
     title = {{\CYRN}{\cyre}{\cyrishrt}{\cyrt}{\cyrr}{\cyra}{\cyrl}{\cyrsftsn}{\cyrn}{\cyrery}{\cyre} {\cyro}{\cyrp}{\cyre}{\cyrr}{\cyra}{\cyrc}{\cyri}{\cyri} (n,m)- 

 {\cyrg}{\cyrr}{\cyru}{\cyrp}{\cyrp}{\cyro}{\cyri}{\cyrd}{\cyro}{\cyrv}},
     journal = {Novi Sad Journal of Mathematics},
     pages = {125-137},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {1989},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1989_19_2a_12/}
}