Sameerah Jamal and Abdul Hamid Kara and Ashfaque H. Bokhari, Symmetries, Conservation Laws and Reduction of Wave and Gordon-type Equations on Riemannian Manifolds. journal = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology. December 2011, vol. 60(12). 2105 - 2108 [viewed 23 April 2024]. Available from: https://publications.waset.org/pdf/9539.