1. On the theory of the neutronic method for measuring the water content in soil;Ølgaard;Risö Report No. 97,1965
2. Comparative experimental and theoretical investigations of the neutronic method for measuring the water content in soil;Haahr,1965
3. Neutron cross sections;Hughes,1958
4. S. Glasstone and M. C. Edlund. The elements of nuclear reactor theory (Van Nostrand, New York).
5. P. L. Ølgaard, Description of the MOPS-II-C programme. Risö memo No. 481 (to be published).