This sixth Volume of the International Workshop on Instabilities and
Nonequilibrium Structures is dedicated to the memory of my friend Walter
Zeller, Professor of the Universidad C'at6lica df' Valparaiso and
Vice-Director of the Workshop. Walter Zeller was much more than an
organizer of this meeting: his enthusiasm, dedication and critical views
were many times the essential ingredients to continue with a task which
in occasions faced difficulties and incomprehensiolls. It is in great
part due to him that the workshop has adquired to-day tradition.
maturity and international recognition. This Volume should have been
coedited by Walter and it is with df'ep emotion that I learned that his
disciples Javier Martinez and Rolando Tiemann wanted as a last hommage
to their Professor and friend to coedit tfus book. No me seria posible
terminal' estas lineas sin pensar en la senora Adriana Gamonal de Zelln.
qUf' ella encuentre en este libro la admiraci6n y reconocimiento hacia
su marido de quiPIlf's [l\Prall sus discipulos, colegas y amigos.