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Thanks "@Charles Matthews". I did email Prof. Berndt (after seeing your comment) and he suggested me to look at this paper:

The result appears here in Page $60$ of the above link60. with proof.
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Thanks "@Charles Matthews". I did email Prof. Berndt (after seeing your comment) and he suggested me to look at this paper:

The result appears in Page $60$ of the above link.

show/hide this revision's text 1

Thanks "@Charles Matthews". I did email Prof. Berndt (after seeing your comment) and he suggested me to look at this paper:

The result appears in Page $60$ of the above link.