References
Additional information on this dataset may be found in:


Trenberth, K. E., D. P. Stepaniak and J. M. Caron, 2002:
Interannual variations in the atmospheric heat budget. 
J. Geophys. Res.,  107, D8, 10.1029/2000D000297.

Waliser, D.E., Zhou, W.F., 1997: Removing satellite equatorial 
crossing time biases from the OLR and HRC datasets.
J. Climate 10 (9): 2125-2146. 

NCAR Tech Note TN-371, "Monthly Mean Satellite Data Sets Available in CCM
 History Tape Format", Hurrell and Campbell

Gruber, A., Krueger A. "The Status of the NOAA Outgoing Longwave Radiation Data Set",
BAM, Sep 1984.