S. E.-G. N. A.-O. M. A.-O. Saud Al-Otebi , Ghalib Al-Otebi, “EXPLICIT ANALYTICAL SOLUTIONS FOR THE WAVE- LIKE EQUATIONS IN (1+1)- , (2+1)- AND (3+1) - DIMENSIONS”, engineering and maths, vol. 1, no. 4, Oct. 2013.