1. D. Bovet and F. Bovet-Nitti, Structure and Pharmacodynamic Activity of Drugs of the Vegetative Nervous System [in French], Basel (1948), p. 141.
2. N. A. Babiyan, A. A. Gamburyan, D. Kh. Shaapuni, et al., Arm. Khim. Zh.,26, 164 (1973).
3. D. N. Kursanov, V. N. Setkina, and V. M. Ridionov, Izv. Akad. Nauk SSSR, Otd. Khim. Nauk, No. 2, 228 (1948).
4. V. N. Setkina and D. N. Kursanov, Izv. Akad. Nauk SSSR, Otd. Khim. Nauk, No. 1, 81 (1951).
5. D. N. Kursanov and S. V. Vitt, Dokl. Akad. Nauk SSSR,113, 607 (1957).