"P. M. Sivakumar" . . "Sivakumar" . "Ponnurengam" . "Ponnurengam Malliappan Sivakumar" . "http://www.wikidata.org/entity/Q6581097" . "P." . "P.M Sivakumar" . "M." . . "Ponnurengam Malliappan Sivakumar" . "Ponnurengam Malliappan" . "P.M. Sivakumar"@nl-NL . "Malliappan" . "M" . . . "P.M" . "P. M Sivakumar"@en-CA . . .