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Kobayashi, O.; Kondo, T. (2008). Age Determination of the Freshwater Pearl Mussel Margaritifera laevis (Bivalvia: Margaritiferidae) in the Chubu-Nougu River, Nagano Prefecture. Venus (Journal of the Malacological Society of Japan). 67 (1-2): 61-71.
Kobayashi, O.; Kondo, T. (2008). Age Determination of the Freshwater Pearl Mussel Margaritifera laevis (Bivalvia: Margaritiferidae) in the Chubu-Nougu River, Nagano Prefecture. Venus (Journal of the Malacological Society of Japan). 67 (1-2): 61-71.