http://doi.acm.org/10.1145/984497.984500 db/journals/sigmod/Furtado81.html Antonio L. Furtado Horizontal Decomposition to Improve a Non-BCNF Scheme. 26-32 sigmodR/12-1/P026.pdf 1981 12 SIGMOD Record 1 db/journals/sigmod/sigmod12.html#Furtado81