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Tey, Kok Soon; Mekhilef, Saad . (2014). Modified incremental conductance MPPT algorithm to mitigate inaccurate responses under fast-changing solar irradiation level. Solar Energy, 101(), 333–342. doi:10.1016/j.solener.2014.01.003 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research