@article{MZ_1962__78_170021,
     author = {I.D. MacDonald},
     title = {On {Certain} {Varieties} of {Groups.} {II.}},
     journal = {Mathematische Zeitschrift},
     pages = {175--188},
     year = {1962},
     volume = {78},
     zbl = {0101.26301},
     url = {http://geodesic.mathdoc.fr/item/MZ_1962__78_170021/}
}