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2. 2) Y. Honma, Y. Nakamura, A. Aoyagi, K. Minowa, and Y. Kogawara: Sighting, stranding and striking records of cetaceans along the coast and offshore of Niigata District, Sea of Japan, from January to May, 1997. Nihonkai Cetol., 8, 1-6 (1998) (in Japanese).
3. 3) Y. Honma, Y. Nakamura, A. Aoyagi, K. Minowa, and Y. Kogawara: Sighting and stranding records of whales and pinnipeds along the coast and offshore of Niigata District, since May 1997. Nihonkai Cetol., 9, 1-6 (1999) (in Japanese).
4. 4) Y. Honma: Revised records of the large marine animals stranded on the coast of Niigata and Sado Island in the Sea of Japan. Spec. Publ. Sado Mar. Biol.. Star., Niigata Univ., 5, 1-39 (1990).
5. 5) Y. Honma: Sighting and stranding records of whales and dolphins in Niigata District, since April 1994. Nihonkai Cetol., 6, 7-13 (1996) (in Japanese).