@article {1999, title = {Extremal faces of the range of a vector measure and a theorem of Lyapunov}, journal = {J. Math. Anal. Appl. 231 (1999) 301-318}, number = {SISSA;4/98/M}, year = {1999}, publisher = {Elsevier}, doi = {10.1006/jmaa.1998.6260}, url = {http://hdl.handle.net/1963/3370}, author = {Stefano Bianchini} }