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Ulf Zackrisson; Carl O. Löfman; Per Olof Janson; Ann Wallin; Masato Mikuni; Mats Brännström. (2011). Alterations of follicular microcirculation and apex structure during ovulation in the rat. , 157(2), 169–174. doi:10.1016/j.ejogrb.2011.03.025 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research