1. Bracewell, R. M.: 1965,The Fourier Transform and Its Application, McGraw-Hill Book Co., New York London, 381 pp.
2. Dutton, J. A.: 1962, ?Space Time Response of Airborne Radiation Sensors for the Measurement of Ground Variables?,J. Geophys. Res. 67, 195?205.
3. Lathi, B. P.: 1965,Signals, Systems and Communications, John Wiley and Sons, Inc., New York, p. 607.
4. Leonard, R. E.: 1967,Albedo of a Red fine Plantation, Univ. Microfilms, Ann Arbor, Michigan, p. 109.
5. U.S. Forest Serv. Res. Paper NE-92;R. E. Leonard,1968