1. Taylor, J. G. & Balanovski, E. Nature 275, 64 (1978).
2. Tromp, W. S. Psychical Physics (North Holland, Amsterdam, 1954).
3. Kervran, C. 1st European Parapsych. Conf. Barcelona (1976); Transmutations a faible energie, (Librarie Malorine, Paris, 1972).
4. Dubrov, A. Impact of Science on Society 24, 311 (1974).
5. Sarfatti, J. J. Psych. Syst. 1, 3–10 (1974).