1. E. Polli, Arch. Sci. Med.82, 425 (1946); Atti 7° Cong. Soc. It. Ematol. 333 (1947); Atti Soc. Lomb. Sci. Med. Biol.1, 7 (1946).
2. E. Polli, Ann. Biol. norm. e pat.1, 4 (1947); Boll. Soc. It. Biol. Sper.25, 48 (1949).
3. E. Polli, Atti Cong. Soc. It. Med. Int.48, 253 (1947); Exp. Cell Res.1, 460 (1950).
4. B. Thorell, Acta Med. Scand.129, Suppl. 200 (1947).
5. M. L. Petermann andE. J. Mason, Proc. Soc. Exp. Biol. a. Med.69, 542 (1948).