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Said Laachir and  Aziz Laaribi,  Exact Solutions of the Helmholtz equation via the Nikiforov-Uvarov Method.   journal   = {International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology. January 2013, vol. 73(1). 170 - 173[viewed 19 October 2018]. Available from: http://waset.org/publications/9996665.