Notes, Comments and Preliminary results Jun 07 2011 Jose M. Hernandez and Lola Esteban   Specialized advertising and price competition with endogenous advertising fees   Abstract  Contact Information  Citation  Full Text  -  Note   May 21 2007 Lola Esteban and Jose M. Hernandez   Strategic Targeted Advertising and Market Fragmentation   Abstract  Contact Information  Citation  Full Text  -  Note