@article{NSJOM_1989_19_2a_9,
     author = {U\v{s}an 

 Janez and Tepav\v{c}evi\'c Andreja},
     title = {On a class of 

 bisemilattices},
     journal = {Novi Sad Journal of Mathematics},
     pages = {93-104},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {1989},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1989_19_2a_9/}
}