Jo Erskine Hannay Dag I. K. Sjøberg Tore Dybå A Systematic Review of Theory Use in Software Engineering Experiments. 87-107 2007 33 IEEE Trans. Software Eng. 2 http://doi.ieeecomputersociety.org/10.1109/TSE.2007.12 db/journals/tse/tse33.html#HannaySD07