J. Brakel
- Prefabricated concrete structures in the Netherlands. Vorgetragen bei: . (1965):
- Prefabricated concrete structures in the Netherlands. Vorgetragen bei: Septième Congrès de l'AIPC = Seventh Congress of IABSE = Siebter Kongress der IVBH, Rio de Janeiro, Brazil, 10-16 August 1964. (1964):