sci
hub

to open science
FUBAO XI and G. YIN. (2009). ASYMPTOTIC PROPERTIES OF A MEAN-FIELD MODEL WITH A CONTINUOUS-STATE-DEPENDENT SWITCHING PROCESS. Journal of Applied Probability, 46(1), 221–243. doi:10.2307/25662417 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research