@article{TM_1988_181_a7,
     author = {L. D. Kudryavtsev},
     title = {Variational problems with free ends on bounded and unbounded intervals},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {137--146},
     publisher = {mathdoc},
     volume = {181},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1988_181_a7/}
}