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5. [Demonstration of viruses in the area of water hygiene. I. The significance of virus occurrence and the problem of detecting and evaluating small quantities of virus]. Schäfer E. Arch Hyg Bakteriol; 1970 Aug; 154(4):299-313. PubMed ID: 4335489 [No Abstract] [Full Text] [Related]
9. [Epidemic occurrence of Echo virus type 6 and type 30 infections during the late summer 1967 in Berlin]. Hartmann D. Zentralbl Bakteriol Orig; 1968 May; 207(1):141-4. PubMed ID: 5745199 [No Abstract] [Full Text] [Related]