1. Avara, E.P., 1971-72: Personal communication, Atmospheric Science Lab., White Sands Missile Range.
2. Best, D.L., 1973: An evaluation of noise characteristics, manuscript from University of Oklahoma Meteorology Department (or refer to publication).
3. Bradley, J.H.S., 1971: On the application of statistical methods to scalar interpolation, McGill A.M.R.G. Publication No. 100, 75 pages.
4. Draper, N.R., and H. Smith, 1966: Applied regression analysis, Wiley, 407 pages.
5. Eddy, Amos, 1965: Two-dimensional statistical objective analysis of isotropic scalar data fields, University of Texas Atmospheric Science Group Report No. 5.