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Sabir.H. Mashraqui; Kishor.R. Nivalkar. (1997). Synthesis of anti -[2.2] (2,6) benzothiazolophane: The first example of [2.2]benzofused heterophane. , 38(25), 4487–4488. doi:10.1016/s0040-4039(97)00909-x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research