A facility for user definition of simple problem oriented languages. - Denis M. Manelski; Henry C. Lefkovits; H. J. Hebert (Symposium on Interactive Systems for Experimental Applied Mathematics, 1967)

Data base technology. - Henry C. Lefkovits; Harrison Tellier (ACM Annual Conference (2), 1972)

A Progress Report on the Activities of the CODASYL End User Facility Task Group. - Henry C. Lefkovits (FDT Bull. ACM SIGFIDET SIGMOD, 1976)

A Status Report on the Activities of the CODASYL End User Facilities Commitee (EUFC). - Henry C. Lefkovits (SIGMOD Rec., 1978)