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Rolf M. Zinkernagel; Stephan Ehl; Peter Aichele; Stephan Oehen; Thomas Kündig; Hans Hengartner. (1997). Antigen localisation regulates immune responses in a dose- and time-dependent fashion: a geographical view of immune reactivity. , 156(1), 199–209. doi:10.1111/j.1600-065x.1997.tb00969.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research