The relationship between Hadamard and conventional multiplication for positive definite matrices
In: Linear algebra and its applications, Jg. 92, S. 231-240
A remark on simultaneous inclusions of the zeros of a polynomial by Gershgorin's theorem
In: Numerische Mathematik, Jg. 21 H. 5, S. 425-427Remarks on band matrices
In: Numerische Mathematik, Jg. 10 H. 2, S. 153-161