@article{NSJOM_1993_23_1a_24,
     author = {Crvenkovi\'c Sini\v{s}a and Ru\v{s}kuc Nikola},
     title = {On 

 groupoids having n2 essentially n-ary polynomials},
     journal = {Novi Sad Journal of Mathematics},
     pages = {287-312},
     publisher = {mathdoc},
     volume = {23},
     number = {1},
     year = {1993},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1993_23_1a_24/}
}