On the Surface Group Conjecture Benjamin Fine, Olga G. Kharlampovich, Alexei G. Myasnikov, Vladimir N. Remeslennikov, Gerhard Rosenberger 1-15 PDF
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The integrals in Gradshteyn and Ryzhik. Part 5: Some trigonometric integrals Victor H. Moll, Tewodros Amdeberhan, Luis A. Medina 47-60 PDF