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Yagi, Yasumichi, Shozo Sasaki, Itsuro Terada, Akemi Yoshikawa, Wataru Fukushima, Hirohisa Kitagawa, Takashi Fujimura, Ryohei Izumi, and Katsuhiko Saito. "Massive Pneumoretroperitoneum Arising From Emphysematous Cholecystitis: A Case Report and the Literature Review." BMC Gastroenterol 2015.

Yagi, Yasumichi, et al. "Massive Pneumoretroperitoneum Arising From Emphysematous Cholecystitis: A Case Report and the Literature Review." BMC Gastroenterol 2015.