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Khaldi, Belal; Aiadi, Oussama; Kherfi, Mohammed Lamine . (2019). Combining colour and grey-level co-occurrence matrix features: a comparative study. IET Image Processing, 13(9), 1401–1410. doi:10.1049/iet-ipr.2018.6440 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research