1. University of Recôncavo da Bahia,CETENS/UFRB - Federal,Feira de Santana,Bahia,Brazil,44042-280
2. Federal University of Bahia,PPGEE/DEEC/POLI/UFBA,Salvador,Bahia,Brazil,40210-630
3. University of Victoria,Department of Computer Science,Victoria,BC,Canada,V8P 5C2