Understanding contract audits : an experimental approach / Robert M.M. Bertrand, Arthur J.H.C. Schram, Eddy H.J. VaassenUnderstanding contract audits : an experimental approach / Robert M.M. Bertrand, Arthur J.H.C. Schram, Eddy H.J. VaassenUnderstanding contract audits : an exploration of its value and characteristics by experimental and field research / Robertus Martinus Maria Bertrand