Enrique Fernández-Cara and Anna Doubova, University of Sevilla
E-mails: cara@us.es and doubova@us.es
Phone: (+34) 954 55 7992 and (+34) 954 55 7993
Postal address:
Dpto. EDAN
Facultad de Matemáticas, Universidad de Sevilla
Calle Tarfia s/n
41012 – Sevilla