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4. K. M. Case and P. F. Zweifel, Linear Transfer Theory, Addison-Wesley, Reading, Mass. (1967).
5. Yu. N. Barabanenkov and V. D. Ozrin, Brief Abstracts of Reports of Eights All-Union Symposium on Wave Diffraction and Propagation [in Russian], Vol. 2, Inst. Radiotekh. Elektron., Akad. Nauk SSSR, Moscow (1981), p. 141.