@article{MZ_1965__89_170426,
     author = {Fred Richman and Elbert A. Walker},
     title = {Primary abelian groups as modules over their endomorphism rings.},
     journal = {Mathematische Zeitschrift},
     pages = {77--81},
     publisher = {mathdoc},
     volume = {89},
     year = {1965},
     zbl = {0131.25403},
     url = {http://geodesic.mathdoc.fr/item/MZ_1965__89_170426/}
}