Yoji Chiba, Yuichi Yamazaki, Takahiro Makino, Shinichiro Sato, Naoto Yamada, Takahiro Satoh, Kazutoshi Kojima, Sang Yun Lee, Yasuto Hijikata, and Takeshi Ohshima, "Creation of Color Centers in SiC PN Diodes Using Proton Beam Writing", Materials Science Forum 963, 709-713 (2019).