1. Abramson: Acta med. scand. (Stockh.)26, Suppl., 399 (1928).
2. Alpers, Campbell andPrentiβ: Arch. of Neur.11, 6 (1924).
3. Ayer andSolomon: Arch. of Neur.14, 3 (1925).
4. Barrio: J. Labor. a. clin. Med.9, 54 (1923).
5. Beck u.Steiner: Orv. Hetil. (ung.)67, Nr 40, 499 (1923).