%0 Journal Article %A Baker, J. W. %A Petersen, G. M. %T Extremal points in summability theory %J Compositio Mathematica %D 1965-1966 %P 190-206 %V 17 %I Kraus Reprint %U http://www.numdam.org/item/CM_1965-1966__17__190_0/ %G en %F CM_1965-1966__17__190_0