Affiliation: | (1) Dipartimento di Matematica, Università Cattolica, Via Trieste 17, I-25121 Brescia, Italy (e-mail: m.degiovanni@dmf.bs.unicatt.it) , IT;(2) Max-Planck-Institute for Mathematics in the Sciences, Inselstr. 22-26, D-04103 Leipzig, Germany (e-mail: schur@mis.mpg.de) , DE |