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by Krickeberg, Klaus; Van Trong, Pham; Hanh, Pham thi My
by Klaus Krickeberg; Pham Van Trong; Pham Thi My Hanh
by Kramer, Alexander; Kretzschmar, Mirjam; Krickeberg, Klaus
by Krickeberg, Klaus; Pham, Thi My Hanh; Pham, Van Trong
by Krickeberg, Klaus; Prohorov, Jurij Vasil'evic; Rozanov, Jurij Anatol'evic; et al.
by Krickeberg, Klaus; Pham, Van Trong; Pham, Thi My Hanh
by Krickeberg, Klaus; Ziezold, Herbert
by Klaus Krickeberg; Van Trong Pham; Thi My Hanh Pham