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Igalavithana, Avanthi Deshani; Mandal, Sanchita; Niazi, Nabeel Khan; Vithanage, Meththika; Parikh, Sanjai J.; Mukome, Fungai N. D.; Rizwan, Muhammad; Oleszczuk, Patryk; Al-Wabel, Mohammad; Bolan, Nanthi; Tsang, Daniel C. W.; Kim, Ki-Hyun; Ok, Yong Sik . (2018). Advances and future directions of biochar characterization methods and applications. Critical Reviews in Environmental Science and Technology, (), 1–56. doi:10.1080/10643389.2017.1421844 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research