Eikichi Nozaki, Shigeru Azuma, Toshiki Aoi, Harumi Torii, Tetsuro Ito, Kishio Maeda, Food Habits of Japanese Black Bear, Bears: Their Biology and Management, Vol. 5, A Selection of Papers from the Fifth International Conference on Bear Research and Management, Madison, Wisconsin, USA, February 1980 (1983), pp. 106-109
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Nozaki et al. (1983) studied this question.
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