Suisanchō Hokkaidō-ku Suisan Kenkyūjo (Japan)

• Heisei 10-nendo Kaiyō Maru dai 3--4-ji chōsa hōkokusho, Nichi-Bei-Ro kyōdō Bēringukai suketōdara onkyō shigen chōsa
• Heisei 9-nendo dai 1-ji chōsa kōkai hōkokusho
• Hokkaidō shūhen kaiiki ni bunpusuru suketōdara narabini teigyorui no shigen chōsa hōkokusho
• Hokkaidō shūhen kaiiki ni okeru teigyorui no shigen chōsa hōkokusho
• Usuzan funka ni yoru kaiyō, seibutsu e no eikyō kinkyū chōsa hōkokusho