G. P. Steinbauer, Buford H. Grigsby, Field and Laboratory Studies on the Dormancy and Germination of the Seeds of Chess (Bromus secalinus L.) and Downy Bromegrass (Bromus tectorum L.), Weeds, Vol. 5, No. 1 (Jan., 1957), pp. 1-4
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Steinbauer et al. (1957) studied this question.