RUBRIC - An Environment for Full Text Information Retrieval. - Richard M. Tong; Victor N. Askman; James F. Cunningham; Carl J. Tollander (SIGIR, 1985)

Conceptual Information Retrieval Using RUBRIC. - Richard M. Tong; Lee A. Appelbaum; Victor N. Askman; James F. Cunningham (SIGIR, 1987)

A knowledge representation for conceptual information retrieval. - Richard M. Tong; Lee A. Appelbaum; Victor N. Askman (Int. J. Intell. Syst., 1989)