@article{NSJOM_2005_35_1a_2,
     author = {S. Ili\'c and B. Janeva and N. Celakoski},
     title = {Free 

 {Biassociative} {Groupoids}},
     journal = {Novi Sad Journal of Mathematics},
     pages = {15-23},
     publisher = {mathdoc},
     volume = {35},
     number = {1},
     year = {2005},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_2005_35_1a_2/}
}