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Howes, R.; Redman-White, W.; Nichols, K.G.; Robinson, M.; Murray, S.; Mole, P. . (1991). [IEEE 1991., IEEE International Sympoisum on Circuits and Systems - Singapore (11-14 June 1991)] 1991., IEEE International Sympoisum on Circuits and Systems - A charge-conserving silicon-on-sapphire SPICE MOSFET model for analogue design. , (), 2160–2163. doi:10.1109/iscas.1991.176717 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research