“…The results of the theoretical work have been verified and used successfully by several authors in investigations of the dislocation content of both plastically deformed single crystals (e.g. Dubrovskiy & Locko, 1968;Wilkens & Bargouth, 1968;Matucha, Franzbecker & Wilkens, 1969;Wilkens, 1976;Wilkens, Herz & Mughrabi, 1980;Karasevskaya & Ryaboshapka, 1980;Ungar, Mughrabi & Wilkens, 1982;Ungar, Mughrabi, R6nnpagel & Wilkens, 1984) and polycrystalline materials (e.g. Oettel, 1971Oettel, , 1973Dao Van Tan, 1972;Yamada, Tanaka & Furusawa, 1974;Klimanek, Grosse & Hensger, 1982;Klimanek, Scherke & Bergner, 1982;Wang Yuming, Lee Shanshan & Lee Yenchin, 1982;Wang Yuming & Zhang Zigung, 1984;Ungar, Toth, Illy& Kovacs, 1986;Tung, Zwui & Wang, 1986).…”