Unital Rings whose Additive Endomorphisms Commute. R.A. Bowshell; P. Schultz — 1977 Mathematische Annalen
Endomorphism rings of valued vector spaces L. Fuchs; P. Schultz — 1981 Rendiconti del Seminario Matematico della Università di Padova
Most abelian p-groups are determined by the Jacobson radical of their endomorphism rings. P. Schultz; J. Hausen; C.E. Praeger — 1994 Mathematische Zeitschrift