Remark on "Algorithm 408: A Sparse Matrix Package (Part 1) [F4]". - U. Harms; H. Kollakowski; G. Möller (ACM Trans. Math. Softw., 1980)

Concept an design of an hypermedia environment for open learning. - Sigmar-Olaf Tergan; U. Harms; Martin Lechner; J. Wedekind (Teleteaching, 1998)