@article{NSJOM_1984__14__a18,
     author = {Doroslova\v{c}ki Rade and To\v{s}i\'c Ratko},
     title = {A characterization of hexagonal systems},
     journal = {Novi Sad Journal of Mathematics},
     pages = {201-209},
     year = {1984},
     volume = {14},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1984__14__a18/}
}