@techreport{R-90-25, TITLE = {Defeasible Inheritance: A Lattice Based Approach}, AUTHOR = {Lin Padgham}, YEAR = {1990}, NUMBER = {R-90-25}, INSTITUTION = ida, ADDRESS = idaaddr, ABSTRACT = {}, IDANR = {LiTH-IDA-R-90-25 }, NOTE = {Also published in Mathematics and Computers with Applications International Journal special issue on Semantic Nets in Artificial Intelligence}