@article{GroetschelLovaszSchrijver1981,
  author    = {Martin Gr{\"o}tschel and L{\´a}szlo Lov{\´a}sz and Alexander Schrijver},
  title     = {The ellipsoid method and its consequences in combinatorial optimization},
  journal   = {IIASA Collab. Proceedings Ser. CP-81-S1},
  pages     = {511 -- 546},
  year        = {1981},
}