@article{SM_2006_197_2_a6,
     author = {Yu. L. Sachkov},
     title = {Discrete symmetries in the generalized {Dido} problem},
     journal = {Sbornik. Mathematics},
     pages = {235--257},
     year = {2006},
     volume = {197},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2006_197_2_a6/}
}