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Kaname Takagi; Masaaki Tanaka; Yukitoshi Murakami; Kuniyoshi Ogura; Katsuyuki Ishii; Hikari Morita; Tomoji Aotsuka. (1987). Synthesis of nitro and amino <em>N</em>-heterocycles <em>via</em> ring transformation of 2-methyl-3-nitrochromone. , 24(4), 1003–1007. doi:10.1002/jhet.5570240420 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research