1. Aron, E.: Histidine. Presse Med. 2:195, 1935.
2. Ackermann, D.; Wasmuth, W.: Z. Physiol. Chem. 260:155, 1939.
3. Barlow, O. W.; Beams, A. J.: A Comparison of the Bronchodilating Action of Several Anti-Asthmatic Agents After Anaphylaxis and Histamine Shock In The Guinea Pig. J. Pharmacol. & Exper. Therapy. 47:111, 1933.
4. Cameron, W. M.; Tainter, M. L.: Comparative Actions of Sympathomimetic Compounds: Broncho-Dilator Actions in Bronchial Spasm Induced by Histamine. J. Pharmacol. & Eper. Therap. 576:152, 1936.
5. Cantarow, A.: Calcium Metabolism and Calcium Therapy, ed. 2. Philadelphia, Lea & Febiger, 1933.