@article{PIM_1989_N_S_46_60_a25,
     author = {R. W. Heath},
     title = {On a {Question} of {Ljubi\v{s}a} {Ko\v{c}inac}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {193 },
     publisher = {mathdoc},
     volume = {_N_S_46},
     number = {60},
     year = {1989},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1989_N_S_46_60_a25/}
}