Pascal Helfer
- Premier dallage précontraint en France sans armature passive. First slab on ground without passif reinforcement in France. Vorgetragen bei: La Technique française du béton, XIIIe congrès de la FIB, Amsterdam 1998. (1998):
- Boulonnais Composite Steel/Concrete PT Bridges. In: VSL News, v. 8, n. 1 ( 1997). (1997):
- Lifting of the Wattrelos Tower Cupola. In: VSL News, v. 8, n. 2 ( 1997). (1997):