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Seiichi Kato; Keiko Nakayama; Takanori Minoura; Mutsuko Konno; Hitoshi Tajiri; Takeshi Matsuhisa; Kazuie Iinuma. (2004). Comparison between the13C-urea breath test and stool antigen test for the diagnosis of childhoodHelicobacter pyloriinfection. , 39(11), 1045–1050. doi:10.1007/s00535-004-1442-6 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research