sci
hub

to open science
Francesco Buccoleri;Andrea Bonfanti;Andrea L. Lacaita;. (2021). A Generalization of the Groszkowski’s Result in Differential Oscillator Topologies . IEEE Transactions on Circuits and Systems I: Regular Papers, (), –. doi:10.1109/tcsi.2021.3077416 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research