@article{CMUC_1981_22_1_a5,
     author = {Poll\'ak, G. and Szendrei, \'Agnes},
     title = {Independent basis for the identities of entropic groupoids},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {71--85},
     year = {1981},
     volume = {22},
     number = {1},
     mrnumber = {609937},
     zbl = {0459.08003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1981_22_1_a5/}
}