@article{51,
      author       = "Mathematical Society. Amsterdam  and Mathematical
                      Programming Society ",
      title        = "<a
                      href="/search?f=title&p=Mathematical%20programming&sc=1&ln=en">Mathematical
                      programming</a>",
      year         = "1971",
      note         = "Suplements: Mathematical programming study = ISSN
                      0303-3929.",
}