Publicacions Matemàtiques (formerly Publicacions de la Secció de Matemàtiques de la Universitat Autònoma de Barcelona) is a journal publishing quality research papers in all fields of Mathematics and, occasionally, expository surveys and proceedings of colloquia. The journal began in 1976, and in 1988 introduced a new format and a broader editorial board. Since then we have been able to combine good standards of published papers with moderate waiting time. Presently, the average publication delay is about seven months. A volume is published each year divided into two issues. For information on prices click the "How to subscribe" button shown above. Correspondence concerning exchanges should be sent to. Servei de Biblioteques, Intercanvi de Publicacions, Universitat Autònoma de Barcelona, Edifici N, Planta 1, 08193 Bellaterra (Barcelona) Spain.