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Borms, Jan; van Roy, Peter; Santens, Jean‐Pierre; Haentjens, Annick . (1987). Optimal duration of static stretching exercises for improvement of coxo‐femoral flexibility∗. Journal of Sports Sciences, 5(1), 39–47. doi:10.1080/02640418708729762 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research