@book{OPUS4-20643, title = {Higher order algebra, logic, and term rewriting: first International Workshop, HOA '93, Amsterdam, The Netherlands, September 23 - 24, 1993; selected papers}, editor = {Jan Heering and Karl Meinke and Bernhard M{\"o}ller and Tobias Nipkow}, isbn = {978-3-540-58233-5}, doi = {10.1007/3-540-58233-9}, year = {1994}, }