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3. Concrete Pipe Assn., 1962. Loads on Buried Concrete Pipes, Tech. Bulletin No.2, Tonbridge.
4. Concrete Pipe Assn., 1967. Bedding and Jointing of Flexibly Jointed Concrete Pipes, Tech. Bulletin No. 1, Tonbridge.
5. Reinforced Concrete fundamentals;Ferguson,1958