[1]
β€œOn Global Smooth Solution of a Semi-linear System of Wave Equations in R3”, J. Part. Diff. Eq., vol. 22, no. 1, pp. 74–96, Feb. 2009, Accessed: Feb. 27, 2026. [Online]. Available: https://www.global-sci.com/index.php/jpde/article/view/4135