@article{SF_1981__23_134513,
     author = {V.V. Rasin},
     title = {On the varieties of {Cliffordian} {Semigroups.}},
     journal = {Semigroup forum},
     pages = {201--220},
     year = {1981},
     volume = {23},
     zbl = {0479.20028},
     url = {http://geodesic.mathdoc.fr/item/SF_1981__23_134513/}
}