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[2]
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[3]
COLLINS RJ, 1988, BRE IP888 INF PAP, P4
[5]
MIDGLEY HG, BRE CP7275 CURR PAP
[6]
MIDGLEY HG, 1975, MAGAZINE CONCRETE RE, V27, P89
[8]
1978, BS4550 BRIT STAND 3
[9]
1975, REPORT COMMITTEE P H
[10]
1970, BS1881 BRIT STAND IN