1. Fox, M. S., Hotchkiss, R. D.:Initiation of bacterial transformation. Nature 179: 1322, 1957.
2. Földes, J., Trautner, T. A.:Infectious DNA from a newly isolated B. subtilis phage. Ztchr. Vererbgsl. 95: 57, 1964.
3. Harm, W., Rupert, C. S.:Infection of transformable cells of Haemophilus influenzae by bacteriophage and bacteriophage DNA. Ztschr. Vererbsl. 94: 336, 1963.
4. Chaloupka, J., Vereš, K.:The nature and synthetic capacity of fragile cells of Bacilus megatherium partly deprived of cell walls. Experientia 17: 562, 1961.
5. Keil, B., Šormová, Z.:Laboratory biochemical techniques. (In Czech.) Publishing House, Czechoslov. Acad. Sci., 1959.