@article{PFMT_2013_4_a7,
     author = {Xiaolan Yi and A. N. Skiba},
     title = {On some generalizations of permutability and $S$-permutability},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {47--54},
     publisher = {mathdoc},
     number = {4},
     year = {2013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2013_4_a7/}
}