1. Creation of Hierarchic Text with a Computer Display;Hansen,1971
2. Environnement de Programmation Mentor: Présent et Avenir;Donzeau-Gouge,1981
3. Programming Environments Based on Structured Editors: The MENTOR Experience;Donzeau-Gouge,1984
4. The Second Compendium of Gandalf Documentation;Habermann,1982
5. Automatic deletion of obsolete information