1. P. V. Makarov, The Physicochemical Properties of the Cell and Methods for The ir Study [in Russian], Leningrad (1948).
2. H. G. Du Buy et al., Science,145, (1964), p. 163.
3. P. Rous, J. Exp. Med.,41 (1925), p. 399.
4. M. G. Sprick, Am. Rev. Tuberc.,74, (1956), p. 552.