@article{IM2_1976_10_3_a8,
     author = {A. Ya. Dubovitskii},
     title = {Solution of a~problem of {S.~Ulam} on optimal matching of segments},
     journal = {Izvestiya. Mathematics},
     pages = {639--651},
     year = {1976},
     volume = {10},
     number = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1976_10_3_a8/}
}