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[Elimination of salmonellas from community waste water].
Gastmeier P, Gastmeier K, Knaack J, Ritschel H. Gastmeier P, et al. Among authors: ritschel h. Z Gesamte Hyg. 1985 Sep;31(9):521-3. Z Gesamte Hyg. 1985. PMID: 4072297 German. No abstract available.
[E. coli septicemia from the viewpoint of internal medicine].
Hennemann HH, Ritschel H. Hennemann HH, et al. Among authors: ritschel h. Dtsch Med Wochenschr. 1972 May 19;97(20):797-800 passim. doi: 10.1055/s-0028-1107444. Dtsch Med Wochenschr. 1972. PMID: 4553767 German. No abstract available.