Factorization of Positive Operator Valued Functions on a Banach Space A. MiameeH. Salehi Indiana University Mathematics Journal 1975 text pdf 10.1512/iumj.1975.24.24008 10.1512/iumj.1975.24.24008 en Indiana Univ. Math. J. 24 (1975) 103 - 113 state-of-the-art mathematics http://iumj.org/access/