@article{MAT_1959_3_4_a1,
     author = {Ph. J. Higgins},
     title = {Groups with multiple operators},
     journal = {Matematika},
     pages = {55--106},
     publisher = {mathdoc},
     volume = {3},
     number = {4},
     year = {1959},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAT_1959_3_4_a1/}
}