@article{MM2_1974__13_154259,
     author = {Joel S. Cohen and Arthur B. Stephens},
     title = {Optimization {Problems} for {KG.}},
     journal = {Manuscripta mathematica},
     pages = {131--142},
     publisher = {mathdoc},
     volume = {13},
     year = {1974},
     zbl = {0287.46080},
     url = {http://geodesic.mathdoc.fr/item/MM2_1974__13_154259/}
}