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- For a large number of problems there will be some animal of choice or a few such animals on which it can be most conveniently studied.
- A. Krogh (1929). The progress of physiology, American Journal of Physiology 90:243–251.
- See Krogh Principle
- Famously quoted by an important microbiologist in: Krebs H. A. (1975). The August Krogh Principle: "For many problems there is an animal on which it can be most conveniently studied." Journal of Experimental Zoology 194:221–226.