Thomas Pirlein Rudi Studer An environment for reusing ontologies within a knowledge engineering approach. 945-965 1995 43 Int. J. Hum.-Comput. Stud. 5-6 http://dx.doi.org/10.1006/ijhc.1995.1083 db/journals/ijmms/ijmms43.html#PirleinS95