@article{MZ_1970__116_171383,
     author = {Duncan H. Martin},
     title = {Total {Convexity} for {Parametric} {Multiple} {Integrals} in the {Calculus} of {Variations.}},
     journal = {Mathematische Zeitschrift},
     pages = {205--214},
     publisher = {mathdoc},
     volume = {116},
     year = {1970},
     zbl = {0194.42502},
     url = {http://geodesic.mathdoc.fr/item/MZ_1970__116_171383/}
}