@article{499,
      author       = "Jacchia, L. G. and Smiths. Institution Astroph. Observat.",
      title        = "A Study of the Semiannual Density Variation in the Upper
                      Atmosphere from 1958 to 1966, Based on Satellite Drag
                      Analysis  ",
      year         = "1968",
      note         = "1 brož., viz Slowey, J. W., Campbell, I. G.",
}