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Shiyang, Gong (author), Zhiyao, Wu (author)Proceedings of a congerence in Zhenzhou, China, 1990: Gong Shiyan, Wu Zhiyao: Introduction. Bao Zicheng, Zhang Mingde, Wang Rudiu: Strenghtening of dykes by Warping. Cheng Zidao, Liu Yuli: To remedy hidden defects in dykes by probing with pointed steed rods and subsequent grouting. Hu Yisan: River training works on the lower reaches of the...report 1990