@article{MM2_1991__71_3_155604,
     author = {Walter Senn},
     title = {Strikte {Konvexit\"at} f\"ur {Variationsprobleme} auf dem n-dimensionalen {Torus.}},
     journal = {Manuscripta mathematica},
     pages = {45--66},
     publisher = {mathdoc},
     volume = {71},
     number = {3},
     year = {1991},
     zbl = {0725.49010},
     url = {http://geodesic.mathdoc.fr/item/MM2_1991__71_3_155604/}
}