W. M. Yio Abdul H. Sadka Ahmet M. Kondoz Multi-Rate Variable-Quality VOP Shape Coder. 46-50 1999 ICMCS, Vol. 2 http://computer.org/conferen/proceed/icmcs/0253/volume%202/02530046abs.htm db/conf/icmcs/icmcs99-2.html#YioSK99