@article{104704,
      recid = {104704},
      title = {The study of comets : the proceedings of IAU Colloquium  no. 25, held at Goddard Space Flight Center, Greenbelt,  Maryland, October 28-November 1, 1974 /. IAU Colloquium},
      publisher = {Scientific and Technical Information Office, National  Aeronautics and Space Administration,},
      address = {Washington :},
      pages = {2 v. (xxii, 1083 p.) :},
      year = {1976},
      url = {http://library.usi.edu/record/104704},
}