1. J. Hero and M. Herova, Bratisl. Lèk. Listy,38, 29 (1958).
2. E. A. Denisova, Sov. Med., No. 4, 7 (1966).
3. F. Jenkner, Rheoencephalography [Russian translation], Moscow (1966).
4. A. A. Kedrov, Klin. Med., No. 1, 71 (1941).
5. A. A. Kedrov, Klin. Med., No. 5, 32 (1948).