@techreport{R-90-22, TITLE = {Using Path-algebras to Encode Directed Graph Knowledge-bases}, AUTHOR = {Peter Eklund}, YEAR = {1990}, NUMBER = {R-90-22}, INSTITUTION = ida, ADDRESS = idaaddr, ABSTRACT = {}, IDANR = {LiTH-IDA-R-90-22}, NOTE = {Also in Proc. of 4th Annual Workshop on Conceptual Structures, Detroit, August 1989}