Mazėtis, Edmundas, and Grigorijus Melničenko. “Algebraic Values of Sines and Cosines and Their Arguments”. Lietuvos matematikos rinkinys 61, no. B (March 15, 2021): 21–28. Accessed November 7, 2025. https://www.zurnalai.vu.lt/LMR/article/view/22717.