@article{10_4064_ap_29_4_397_401,
     author = {A. Pli\'s},
     title = {Uniqueness of optimal trajectories for non-linear control systems},
     journal = {Annales Polonici Mathematici},
     pages = {397--401},
     publisher = {mathdoc},
     volume = {29},
     number = {4},
     year = {1974},
     doi = {10.4064/ap-29-4-397-401},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-29-4-397-401/}
}