William H. Romme, Laura Bohland, Cynthia Persichetty, Tanya Caruso, Germination Ecology of Some Common Forest Herbs in Yellowstone National Park, Wyoming, U.S.A., Arctic and Alpine Research, Vol. 27, No. 4 (Nov., 1995), pp. 407-412
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Romme et al. (1995) studied this question.
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