నీలకంఠ సోమయాజి: కూర్పుల మధ్య తేడాలు

*{{cite journal|last=Ranjan Roy|date=Dec. 1990|title=The discovery of the series formula for π by Leibnitz, Gregory and Nilakantha|journal=Mathematics Magazine|publisher=Mathematical Association of America|volume=63|issue=5|pages=291–306|url=http://mathdl.maa.org/images/upload_library/22/Allendoerfer/1991/0025570x.di021167.02p0073q.pdf|accessdate=18 January 2010|doi=10.2307/2690896|archiveurl=http://web.archive.org/web/20120224013439/http://mathdl.maa.org/images/upload_library/22/Allendoerfer/1991/0025570x.di021167.02p0073q.pdf|archivedate=24 February 2012}}

 

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