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Jin-ichi Obana, Kemmi Yoshikawa, Yukari Kanki, Eriko Shiga, Masako Nakajima, Yasue Suzuki, Yoshihiro Ishikawa, Minoru Abe, Takayoshi Miyata, Takashi Ohyama. "A Clinical Survay of Removable Partial Dentures Retained by OPA Attachments." Nihon Hotetsu Shika Gakkai Zasshi 25.4 (1981) 725-732