%0 Journal Article %D 1999 %T Projection singularities of extremals for planar systems %A Ugo Boscain %A Benedetto Piccoli %I SISSA Library %G en %U http://hdl.handle.net/1963/1304 %1 3151 %2 Mathematics %3 Functional Analysis and Applications %$ Made available in DSpace on 2004-09-01T12:56:02Z (GMT). No. of bitstreams: 0\\n Previous issue date: 1999