1. M. Aloisi, Arch. Anat. Pat. e Med. Clin.3, 1 (1940); Atti Soc. it. Patol.2, 284 (1951).
2. B. O. Houchin eH. A. Mattill, J. Biol. Chem.146, 301 (1942).
3. A. Szent-Györgyi, Acta physiol. Scand.9, suppl. 25 (1945).
4. G. Feuer, F. Molnar, E. Pettko eF. B. Straub, Hung. acta physiol.1, 150 (1948).
5. T. Erdös, Studies Inst. Med. Chem. Univ. Szeged3, 51 (1943).