1. Kitaoka, M., et al. 1967. Report of the 19th General Meeting of the Eastern Part of Japan. Jap. Assoc. Of Sanit. Zool. (in Japanese). 2. Saiki, K. 1955. Nihon Iji Shimpo. No. 1611. 1247 (in Japanese). 3. Okubo, K., et al. 1955. Ibid., 1247-1248 (in Japanese).
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