1. Bitter, Gundel, Sancho: Zbl. Bakter. I Orig.97, 132 (1926).
2. Brugi: Giorn. Batter.1928, S. 38.
3. Busson: Zbl. Bakter. I Orig.132, 355 (1934).
4. Clauberg: Zbl. Bakter. I Orig.114, 539 (1929);128, 265 (1933);132, 470 (1934).
5. Costa, Troisier, Dauvergne: Presse méd.13, 113 (1919).