@book {MR0178386,
    AUTHOR = {Lyusternik, L. A.},
     TITLE = {Shortest paths. {V}ariational problems},
    SERIES = {Translated and adapted from the Russian by P. Collins and
              Robert B. Brown. Popular Lectures in Mathematics, Vol. 13},
 PUBLISHER = {A Pergamon Press Book. The Macmillan Co., New York},
      YEAR = {1964},
     PAGES = {x+102},
   MRCLASS = {49.00 (52.40)},
  MRNUMBER = {0178386 (31 \#2644)},
MRREVIEWER = {O. Bottema},
  BOEKCODE = {49-00},
}

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