D. A. Boag, J. Rolstad, Workshop Summary: Aims and Methods of Managing Forests for the Conservation of Tetraonids, Ornis Scandinavica (Scandinavian Journal of Ornithology), Vol. 22, No. 3, Proceedings of the 5th International Symposium on Grouse, 20-24 August 1990, Elverum, Norway (Jul. - Sep., 1991), pp. 225-226
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Boag et al. (1991) studied this question.