@article{MZ_1976__149_172379,
     author = {Thomas J. Laffey},
     title = {The {Number} of {Solutions} of x3 = 1 in a {3-Group.}},
     journal = {Mathematische Zeitschrift},
     pages = {43--46},
     publisher = {mathdoc},
     volume = {149},
     year = {1976},
     zbl = {0314.20020},
     url = {http://geodesic.mathdoc.fr/item/MZ_1976__149_172379/}
}