Poonchayar Patthanangkoor และ Koranan Kaewkumsai; Nattawadee Charoenthong; Siripatana Tikamma. (2023) Formulas for the Matrix Cosine and Sine of the Lie Algebra of Lorentz Matrix Lie Group SO(1, 3). <i>Thai Science and Technology Journal</i>, <i>31</i>(6), 1-12.Poonchayar Patthanangkoor และ Koranan Kaewkumsai; Nattawadee Charoenthong; Siripatana Tikamma. "Formulas for the Matrix Cosine and Sine of the Lie Algebra of Lorentz Matrix Lie Group SO(1, 3)". Thai Science and Technology Journal 31 (2023):1-12.Poonchayar Patthanangkoor และ Koranan Kaewkumsai; Nattawadee Charoenthong; Siripatana Tikamma. Formulas for the Matrix Cosine and Sine of the Lie Algebra of Lorentz Matrix Lie Group SO(1, 3). Research Division:ม.ป.ท. 2023.