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Apel, Jytte M; Lacey, Ryan M; Kell, Robert T . (2011). A Comparison of Traditional and Weekly Undulating Periodized Strength Training Programs With Total Volume and Intensity Equated. Journal of Strength and Conditioning Research, 25(3), 694–703. doi:10.1519/jsc.0b013e3181c69ef6 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research