Mansour Zand Victor R. Basili Ira D. Baxter Martin L. Griss Even-André Karlsson Dewayne E. Perry Reuse R&D: Gap Between Theory and Practice. 172-177 1999 SSR http://doi.acm.org/10.1145/303008.303081 db/conf/ssr/ssr99.html#ZandBBGKP99