@article{NSJOM_1981_11_Nonea_19,
     author = {Niki\'c 

 Jovanka},
     title = {On a 

 structure {\cyrf} 

 satisfying ({\cyrf}2+1)({\cyrf}2-a)=0},
     journal = {Novi Sad Journal of Mathematics},
     pages = {209-216},
     publisher = {mathdoc},
     volume = {11},
     year = {1981},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1981_11_Nonea_19/}
}