1. Facaoaru, J., ‘Romanian achievements in nondestructive strength testing of concrete’, in ‘In Situ/Nondestructive Testing of Concrete’, Proceedings of an International Conference, Ottawa, October 1984 (American Concrete Institute, Detroit, 1984), pp. 35–56.
2. Newman, K., ‘The ready mixed concrete producers view of in situ’,ibid. ‘, pp. 479–500.
3. Pauše, Ž and Trupčević, D., ‘Algoritmi za odredjivanje planova kontrole pri proizvodnji betona’,Materijali i konstrukcije 23(3) (1980) 59–63.
4. Walpole, R. E. and Myers, R. H., ‘Probability and Statistics for Engineers and Scientists’ (Collier Macmillan International Editions, 1978).
5. Bellander, U. and Petersons, N., ‘Quality of finished concrete structures’, Working Document (Swedish Cement and Concrete Research Institute, Stockholm, 1979) pp. 313–369.