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Andrzej Loesch; Suhel Miah; Geoffrey Burnstock. (1999). Ultrastructural localisation of ATP-gated P2X2 receptor immunoreactivity in the rat hypothalamo-neurohypophysial system. , 28(6), 495–504. doi:10.1023/a:1007009222518 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research