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by Demko, George J.
by Annenkov, Vladimir V.; Demko, George J.
by Demko, George J.; Jackson, Michael C.
by Demko,George J
by George J Demko; Michael C. Jackson
by Vladimir V. Annenkov; George J Demko
by George J Demko
by Demko, George J.; Agel, Jerome; Boe, Eugene