OBSCURE - A Language for Algorithmic Specifications. - Claus-Werner Lermen (ADT, 1983)

OBSCURE, A New Specification Language. - Claus-Werner Lermen; Jacques Loeckx (ADT, 1984)

A Protocol for Distributed Reference Counting. - Claus-Werner Lermen; Dieter Maurer (LISP and Functional Programming, 1986)