@article{PFMT_2013_2_a10,
     author = {Yu. I. Kulazhenko},
     title = {On semicenters of $l$-ary groupoids},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {76--80},
     publisher = {mathdoc},
     number = {2},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2013_2_a10/}
}