@article{MOMA_1962__66_177150,
     author = {Raymond M. Redheffer},
     title = {An {Extension} of {Certain} {Maximum} {Principles.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {32--42},
     publisher = {mathdoc},
     volume = {66},
     year = {1962},
     zbl = {0115.31201},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1962__66_177150/}
}