1. Atanasiu, P. undLépine, P. 1959. Ann. Inst. Pasteur96, 72.
2. Bauer, W. H. undGrand, N. G. 1954. Cancer Research14, 768.
3. Bierman, H. R., Hammon, W. McD., Eddie, B. U., Meyer, K. F. undShimkin, M. B. 1950. Cancer Research10, 203.
4. Cerusia, O. 1928. C. rend. Soc. Biol.99, 900.
5. Collier, W. A., de Roever-Bonnet undHoekstra, J. 1959. Antonie van Leeuwenhoek25, 113.