Means-End Relations and a Measure of Efficacy.

Jesse Hughes Albert C. Esterline Bahram Kimiaghalam Means-End Relations and a Measure of Efficacy. 83-108 2006 15 Journal of Logic, Language and Information 1-2 http://dx.doi.org/10.1007/s10849-005-9008-4 db/journals/jolli/jolli15.html#HughesEK06