@article{SM_2003_194_9_a2,
     author = {Yu. L. Sachkov},
     title = {Exponential map in the~generalized {Dido} problem},
     journal = {Sbornik. Mathematics},
     pages = {1331--1359},
     year = {2003},
     volume = {194},
     number = {9},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2003_194_9_a2/}
}