1. Gg. Abraham, Arch. Kinderheilk.90, 161 (1930).
2. Bock u.Wiede, Fol. haemat. (Lpz.)42, 1 (1930).
3. Vasaturo Lessandro, Fol. med. (Napoli)16, 1525 (1930).
4. G. Angelini, Riv. Clin. med.35, 349 (1934).
5. Bacaloglu etEnarchesko, Sang6, 233, 341 (1932).