In: Defects in insulating crystals. Year 1981. Riga, 1981, Pg. 232-252

In: Journal of chemical research. Year 1981. Cambridge, 1981, Pg. 116-117

In: Implementierungssprachen für nichtsequentielle Programmsysteme. Year 1981. Stuttgart, 1981, Pg. 119-132

In: Game theory and related topics : proceedings of the Seminar on Game Theory and Related Topics, Bonn/Hagen, 26 - 29 September, 1978. Year 1981. Amsterdam [u.a.], 1981, Pg. 193-204

In: PEARL-Rundschau. Year 2.1981 Vol. 3, 1981, Pg. 19-31

In: Functional Analysis, Holomorphy and Approximation Theory (Springer Lecture Notes in Mathematics : 843). Year 1981. Berlin [u.a.], 1981, Pg. 296-318

In: Progress of Theoretical Physics. Year 1982. Kyoto, 1981, Pg. 1082-1104

In: Progress of Theoretical Physics. Year 1981. Kyoto, 1981, Pg. 861-876

In: Transactions of the American Mathematical Society. Year 1981. Providence, RI, 1981, Pg. 235-250

In: Progress of Theoretical Physics. Year 1983. Kyoto, 1981, Pg. 1508-1522

In: Wirtschaft. Year 1981. Bad Heilbrunn/Obb., 1981, Pg. 221-223

In: Atti del Congresso dell'AICA / Associazione Italiana per il Calcolo Automatico. Year 1980. Bologna, 1981, Pg. 279-294

In: Mathematical foundations of computer science. 1975 : trbské Pleso, Czechoslovakia, August 31 - September 4, 1981 (Lecture notes in computer science : 118). Year 1981. Berlin [u.a.], 1981, Pg. 433-441

In: KI - Klima, Kälte, Heizung. Year 9.1981 Vol. 5, 1981, Pg. 330-424

In: PM : Praxis der Mathematik in der Schule : Sekundarstufen 1 und 2. Year 1981. Köln ; Leipzig, 1981, Pg. 114-116