@article{SMJ2_2013_39_1_a4,
     author = {Kurdachenko, Leonid A. and Otal, Javier and Subbotin, Igor Ya.},
     title = {On {Permutable} {Fuzzy} {Subgroups}},
     journal = {Serdica Mathematical Journal},
     pages = {83--102},
     publisher = {mathdoc},
     volume = {39},
     number = {1},
     year = {2013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SMJ2_2013_39_1_a4/}
}