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Marksteiner, J.; Saria, A.; Krause, J.E.. (1992). Comparative distribution of neurokinin B-, substance P- and enkephalin-like immunoreactivities and neurokinin B messenger RNA in the basal forebrain of the rat: Evidence for neurochemical compartmentation. , 51(1), 107–120. doi:10.1016/0306-4522(92)90475-H 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research