@article{805006,
  author = {James Butler and B. Johnson and R Barnes},
  title = {Radiometric Measurement Comparisons at NASA's Goddard Space Flight Center: Part I. The GSFC Sphere Sources},
  year = {2002},
  number = {14},
  month = {2002-01-01 00:01:00},
  publisher = {The Earth Observer},
  language = {en},
}