1. Barnum , J. R. 1970 The effect of polarization rotation on the amplitude of ionospherically propagated sea backscatter Stanford, Calif.
2. Barnum , J. R. The effect of polarization rotation on the amplitude of ionospherically propagated sea backscatter Stanford, Calif. 1970
3. Barrick , D. E. W. H. Peake Scattering from surfaces with different roughness scales: Analysis and Interpretation Columbus, Ohio 1967
4. A review of scattering from surfaces with different roughness scales;Barrick;Radio Sci.,1968