@article{AM2_1991__41_2-3_137393,
     author = {A.M. Shelekhov},
     title = {New closure conditions and some problems in loop theory.},
     journal = {Aequationes mathematicae},
     pages = {79--84},
     year = {1991},
     volume = {41},
     number = {2-3},
     zbl = {0719.20037},
     url = {http://geodesic.mathdoc.fr/item/AM2_1991__41_2-3_137393/}
}