@article{NSJOM_1979_9_Nonea_24,
     author = {{\CYRU}{\cyrsh}{\cyra}{\cyrn} {\CYRYA}{\cyrn}{\cyre}{\cyrz} and {\CYRS}{\cyrt}{\cyro}{\cyrje}{\cyra}{\cyrk}{\cyro}{\cyrv}{\cyri}{\cyrch} {\CYRZ}{\cyro}{\cyrr}{\cyra}{\cyrn}},
     title = {D-{\cyrp}{\cyro}{\cyrl}{\cyrsftsn}{\cyrn}{\cyrery}{\cyre} 

 {\cyro}{\cyrr}{\cyrt}{\cyro}{\cyrg}{\cyro}{\cyrn}{\cyra}{\cyrl}{\cyrsftsn}{\cyrn}{\cyre} 

 {\cyrs}{\cyri}{\cyrs}{\cyrt}{\cyre}{\cyrm}{\cyra} {\cyrch}{\cyra}{\cyrs}{\cyrt}{\cyri}{\cyrch}{\cyrn}{\cyrery}{\cyrh} 

 {\cyrk}{\cyrv}{\cyra}{\cyrz}{\cyri}{\cyrg}{\cyrr}{\cyru}{\cyrp}{\cyrp}},
     journal = {Novi Sad Journal of Mathematics},
     pages = {175-184},
     publisher = {mathdoc},
     volume = {9},
     year = {1979},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1979_9_Nonea_24/}
}