Mutual aid ↓save

Jay W. Forrester; Nathaniel J. Mass; Charles J. Ryan. (1976). The system dynamics national model: Understanding socio-economic behavior and policy alternatives. , 9(1-2), 51–68. doi:10.1016/0040-1625(76)90044-5 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research