Siège de l'ANWB
- Designed shells and Research Work by Prof. Haas. Dans: Journal of the International Association for Shell and Spatial Structures, n. 36 (décembre 1968), pp. 11-16. (1968):
- Space Structures in the Netherlands Since 1966. Présenté pendant: Second International Conference on Space Structures, University of Surrey, Guildford (UK), 09.1975, pp. 231. (1975):