1. Yu.I. Orlov: Trudy MEI No. 119 ( Moscow Power Engineering Institue, Moscow 1972 ) p. 82
2. Yu.I. Orlov, A.V. Demin: Trudy MEI No. 553 ( Moscow Power Engineering Institute, Moscow 1981 ) p. 5
3. Yu.I. Orlov, A.V. Demin: Trudy MEI No. 497 ( Moscow Power Engineering Institute, Moscow 1980 ) p. 10
4. V.B. Avdeyev, A.P. Yarygin: Theses 12th All-Union Conf. Radiowave Propagation (Nauka, Moscow 1978 ) Vol. 4, p. 294 (in Russian)
5. V.N. Mirolyubov, M.V. Tinin: Theses 8th All-Union Conf. Diffraction and Wave Propagation (Acad. Nauk USSR, Moscow 1982 ) Vol. 2, p. 156 (in Russian)