The writer wishes to congratulate the authors for their very interesting and useful approach. Their methodology is certainly applicable in other fields of applied science and engineering: stress analysis, diffusion problems, electromagnetic theory, structural dynamics, etc.

A very minor criticism which I wish to make concerns the statement made by the authors: “In the generalized Galerkin's method, if we select a set of Dirac delta functions for ψi, we arrive at the collocation method.”

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