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Drabczyńska, Anna; Karcz, Tadeusz; Szymańska, Ewa; Köse, Meryem; Müller, Christa E.; Paskaleva, Minka; Karolak-Wojciechowska, Janina; Handzlik, Jadwiga; Yuzlenko, Olga; Kieć-Kononowicz, Katarzyna . (2013). Synthesis, biological activity and molecular modelling studies of tricyclic alkylimidazo-, pyrimido- and diazepinopurinediones. Purinergic Signalling, 9(3), 395–414. doi:10.1007/s11302-013-9358-3 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research