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Prof. Dr. Thomas M. Klapötke; Franz A. Martin; Dr. Jörg Stierstorfer. (2011). C2N14: An Energetic and Highly Sensitive Binary Azidotetrazole. , 50(18), 4227–4229. doi:10.1002/anie.201100300 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research