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Tarakçioğlu, Mustafa; Erişir, Tülay; Güngör, Mehmet Ali; Tosun, Murat . (2018). The Hyperbolic Spinor Representation of Transformations in $$\mathbb {R}_1^3$$R13 by Means of Split Quaternions. Advances in Applied Clifford Algebras, 28(1), 26–. doi:10.1007/s00006-018-0844-0 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research