@article{MOMA_1977__84_177840,
     author = {Marvin Marcus and Patricia Andresen},
     title = {Constrained {Extrema} of {Bilinear} {Functionals.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {218--236},
     publisher = {mathdoc},
     volume = {84},
     year = {1977},
     zbl = {0387.47006},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1977__84_177840/}
}