@article{1183525795, author = {Chen, Y. W.}, title = {On the solutions of the wave equation in a quadrant of $R^4$}, journal = {Bull. Amer. Math. Soc.}, volume = {70}, number = {6}, year = {1964}, pages = { 172-177}, language = {en}, url = {http://dml.mathdoc.fr/item/1183525795} }
Chen, Y. W. On the solutions of the wave equation in a quadrant of $R^4$. Bull. Amer. Math. Soc., Tome 70 (1964) no. 6, pp. 172-177. http://gdmltest.u-ga.fr/item/1183525795/