@article{NSJOM_1989_19_1a_15,
     author = {{\CYRU}{\cyrsh}{\cyra}{\cyrn} 

 {\CYRYA}{\cyra}{\cyrn}{\cyre}{\cyrz}},
     title = {n-{\cyrk}{\cyrv}{\cyra}{\cyrz}{\cyri}{\cyrg}{\cyrr}{\cyru}{\cyrp}{\cyrp}{\cyrery} 

 {{\CYRB}{\cyro}{\cyrl}{\cyra}}},
     journal = {Novi Sad Journal of Mathematics},
     pages = {185-205},
     publisher = {mathdoc},
     volume = {19},
     number = {1},
     year = {1989},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1989_19_1a_15/}
}