Generalisations of Lyapunov's Theorem on the Range of a Vector Measure Michael Arbib Indiana University Mathematics Journal 1966 text pdf 10.1512/iumj.1966.15.15040 10.1512/iumj.1966.15.15040 en Indiana Univ. Math. J. 15 (1966) 609 - 616 state-of-the-art mathematics http://iumj.org/access/