@article{CM_1965-1966__17__190_0,
     author = {Baker, J. W. and Petersen, G. M.},
     title = {Extremal points in summability theory},
     journal = {Compositio Mathematica},
     pages = {190--206},
     publisher = {Kraus Reprint},
     volume = {17},
     year = {1965-1966},
     mrnumber = {199599},
     zbl = {0144.05301},
     language = {en},
     url = {http://www.numdam.org/item/CM_1965-1966__17__190_0/}
}