00513nam a2200157 a 450000500170000000800410001703500150005804100070007305000210008011000360010124501230013726000270026030000090028744000490029665000100034520260818114015.0                                          a.b102844730 aEn  aTA439 C57 no. 17  aConcrete Society. Working Party 0aFlat slabs in post-tensioned concrete with particular regard to the use of unbonded tendons b- design recommendations  aLondon :bs. n.,c1979  a16 p 0aConcrete Society. Technical report ;vno. 17 0aSlabs