@article{CMUC_1970__11_2_a1,
     author = {Sou\v{c}ek, Vladim{\'\i}r},
     title = {The minimum existence of functional $\int_a^b F( x(t), y(t), \dot{x}(t), \dot{y}(t) ) dt$},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {205--225},
     publisher = {mathdoc},
     volume = {11},
     number = {2},
     year = {1970},
     mrnumber = {0270246},
     zbl = {0197.41702},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1970__11_2_a1/}
}