1. Engelhardt, G., Hahn, G.: Naunyn-Schmiedebergs Arch. exp. Path. Pharmak. 231, 507 (1957).
2. Hahn, F., Bernauer, W.: Int. Arch. Allergy 35, 476 (1969);
3. Arch. int. Pharmacodyn. 184, 129 (1970).
4. Wegmann, A., Renker, H., Kuslys, A.: HeIv. med. Acta 36, 111 (1972).
5. Grant, R. T., Rothschild, P.: J. Physiol. (Lond.) 81, 265 (1934).