Eigenvalues of Coxeter transformations and the Gelfand-Kirillov dimension of the preprojective algebras
In: Proceedings of the American Mathematical Society, Jg. 83 H. 2, S. 228-232
Every semiprimary ring is the endomorphism ring of a projective module over a quasi-hereditary ring
In: Proceedings of the American Mathematical Society, Jg. 107 H. 1, S. 1-5