author = { Tip, Frank AND Sweeney, Peter F. },

title = { Class hierarchy specialization },

publisher = {IBM},

year = {1998},

booktitle = {Research report ; RC / International Business Machines Corporation, Thomas J. Watson Research Center ; 21111},

address = { Almaden [u.a.] },

url = { http://slubdd.de/katalog?TN_libero_mab2 }