Jared T. Freeman Thomas R. Riedl Julian S. Weitzenfeld Gary A. Klein John D. Musa Instruction for Software Engineering Expertise. 271-282 1991 conf/csee/1991 CSEE db/conf/csee/csee1991.html#FreemanRWKM91 http://dx.doi.org/10.1007/BFb0024299