INFORM: An interactive syntax-directed formulae editor. - Sylvia Van Egmond; Frans C. Heeman; Johannes C. van Vliet (J. Syst. Softw., 1989)

Incremental parsing of expressions. - Frans C. Heeman (J. Syst. Softw., 1990)

Granularity in Structured Documents. - Frans C. Heeman (Electron. Publ., 1992)