(F/E/S) : French, English and Spanish version; See English version in ECONOMIC ASPECTS OF TRADEMARKS : (STUDIES ON ...) : WRITTEN BY CONSULTANTS ON THE INVITATION OF THE DIRECTOR GENERAL OF WIPO; See French version in LES ASPECTS ECONOMIQUES DES MARQUES : (ETUDES SUR PREPAREES PAR DES CONSULTANTS SUR L'INVITATION DU DIRECTEUR GENERAL DE L'OMPI;.