1. Flora, de: Reforma med.2, 1664 (1931).
2. Horsters: Z. exper. Med.80, 86 (1932);83, 72 (1932).
3. Horsters u.Rothmann: Dtsch. Arch. klin. Med.167, 363 (1930).
4. Messina: Arch. Farmacol. sper.52, 197 (1931).
5. Pennati: Atti Soc. med. chir. Padova9, 358 (1931).