1. Damen A. A. J., Belt J. J.—Levensduurbepaling van bouwdelen (1+2). Beheer en Onderhoud Nr. 46, 10.1978, pp. 1–20; Nr. 47, 11.1978, pp. 1–7.
2. Inter-Association Colloquium.—Behaviour in service of concrete structures, Liège, 1975 with papers:
3. Lauer K. R.—A world-wide review of reference standards developed for the visual observation of concrete, [2]Liège, Vol. 1, pp. 207–218.
4. Schiessl P.—Admissible crack width in reinforced concrete structures [7]Budapest, Hungary, 17–20 Sept.: Vol. 2, pp. 739–753.
5. Martin H., Rauen A., Schiessl P.—Carbonation of concrete made with different types of cement, [2]Liège,: Vol. 3, pp. 927–937.