1. Benforado, J. M., J. Pharm. Exper. Ther.122, 86 (1958).
2. Bowditch, H. P., Ber. Kgl. Sächs. Ges. Wiss., math.-phys.1871, 654.
3. Bravený, P. andV. Kruta, Arch. Intern. Physiol.66, 633 (1958).
4. Furchgott, R. F., T. de Gubareff, andM. W. McCaman, J. Pharm. Exper. Ther.110, 19 (1954).
5. Garb, S., andM. Penna, Proc. Soc. Exper. Biol. Med.94, 18 (1957).