?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Targonskii%2C+A.+L.&rft.aulast=Targonskii&rft.aufirst=A.+L.&rft.issue=4&rft.date=2016&rft.issn=2297-6213&rft.atitle=On+the+one+extremal+problem+on+the+Riemann+sphere&rft.title=International+Journal+of+Advanced+Research+in+Mathematics&rft.pages=1-7&rft.genre=article