@TechReport{Alexandrov1999,
  author      = {Alexandrov, N. M. and Lewis, R. M.},
  title       = {Comparative properties of collaborative optimization and other approaches to {MDO}},
  institution = {Institute for Computer Applications in Science and Engineering},
  type        = {ICASE Report},
  number      = {99--24},
  note        = {\url{http://techreports.larc.nasa.gov/ltrs/PDF/1999/mtg/NASA-99-asmo-nma.pdf}},
  year        = {1999},
}