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Masaki Okazaki, Hitoshi Onishi, Wataru Yamashita, Shoji Tamai. "Positive-type Photosensitive Polyimide Based on Poly(amide acid), Vinyl Ether Crosslinker, and a Photoacid Generator." Journal of Photopolymer Science and Technology (Fotoporima Konwakai shi) (2008) 119-123