Voir la notice de l'article provenant de la source Novi sad journal of mathematics website
@article{NSJOM_1986_16_2a_15, author = {{\CYRYA}{\cyra}{\cyrn}{\cyre}{\cyrz} {\CYRU}{\cyrsh}{\cyra}{\cyrn}}, title = {k-<2> - {{\CYRP}{\cyro}{\cyrl}{\cyru}{\cyrs}{\cyre}{\cyrt}{\cyri}}}, journal = {Novi Sad Journal of Mathematics}, pages = {173-196}, publisher = {mathdoc}, volume = {16}, number = {2}, year = {1986}, url = {http://geodesic.mathdoc.fr/item/NSJOM_1986_16_2a_15/} }
Яанез Ушан. k-<2> - Полусети. Novi Sad Journal of Mathematics, Tome 16 (1986) no. 2. http://geodesic.mathdoc.fr/item/NSJOM_1986_16_2a_15/