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- [4] ONE LOGJAM BROKEN, ONE STILL HOLDING BACK THE WATERS WATER-ENGINEERING & MANAGEMENT, 1986, 133 (07): : 4 - 4
- [5] Cost of not holding back the sea. Economic vulnerability Ocean & Shoreline Management, 1991, 15 (03):
- [6] Still no danger to north sea dikes Deutscher Forschungsdienst, DF - Special Press Reports, 1990, 6 (04):