@article{10_1155_S1024123X01001600,
     author = {Boltyanski, V.},
     title = {Sufficient conditions for {Lagrange,} {Mayer,} and {Bolza} optimization problems.},
     journal = {Mathematical Problems in Engineering},
     pages = {177},
     publisher = {mathdoc},
     volume = {7},
     number = {2},
     year = {2001},
     doi = {10.1155/S1024123X01001600},
     zbl = {1021.49017},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/articles/10.1155/S1024123X01001600/}
}