Special Issue of LAA devoted to papers presented at the 11th ILAS Conference, Coimbra, July 2004 LAA will publish a special issue devoted to papers presented at the 11th ILAS Conference, Coimbra, July 19 - 22, 2004. Papers should be submitted by 31 October 2004 to one of the special editors whose names and addresses are listed below. The usual standards of LAA will apply. Graciano de Oliveira Departmento de Matematica Apt. 3008, Universidade de Coimbra 3000 Coimbra, Portugal gdoliv@mat.uc.pt Joao Queiro Departmento de Matematica Apt. 3008, Universidade de Coimbra Coimbra, Portugal jfqueiro@mat.uc.pt Bryan Shader Mathematics Department Ross Hall, University of Wyoming Laramie, WY 82071, USA bshader@uwyo.edu Ion Zaballa Departamento de Matematica Aplicada y EIO Universidad del Pais Vasco Apdo 644 48080. Bilbao, Spain mepzatej@lg.ehu.es Editor-in-chief responsible for this issue: Hans Schneider Department of Mathematics University of Wisconsin-Madison 480 Lincoln Drive Madison, WI 53706, USA hans@math.wisc.edu For details of the conference see http://www.mat.uc.pt/ilas2004/ . This issue is dedicated to Richard Brualdi on the occasion of his 65th birthday.