The authors are thankful to Dr. George Keller for pointing out some of the inherent inaccuracies in the method proposed by them and especially for drawing their attention to the work already done along the same lines. The authors were fully aware, at the time of presenting this short note, about the limitations pointed out by Dr. Keller in the use of Hummel's principle, and that the proposed method is very approximate and also that the underlying assumptions cannot stand rigorous theoretical tests.

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