Ferdinand Graber
- Felsanker zur Sicherung des Tosbeckens Nr. 3 in Tarbela (Pakistan). Dans: Schweizerische Bauzeitung (1947-1978), v. 96, n. 17 (27 avril 1978). (1978):
- Encore for offshore - Concrete reaches new depths. Dans: VSL News, v. 1, n. 2 ( 1990). (1990):
- Saudi bridge uses VSL group effort. Dans: VSL News, v. 1, n. 2 ( 1990). (1990):
- VSL stay cables carry main span of bridge in Finland. Dans: VSL News, v. 1, n. 1 ( 1990). (1990):