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Roland KöLliker; Beat Boller; Franco Widmer. (2005). Marker assisted polycross breeding to increase diversity and yield in perennial ryegrass (Lolium perenneL.). , 146(1-2), 55–65. doi:10.1007/s10681-005-6036-8 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research