Interpolation of Operators of Mixed Weak-Strong Type between Rearrangement Invariant Spaces M. Milman Indiana University Mathematics Journal 1979 text pdf 10.1512/iumj.1979.28.28071 10.1512/iumj.1979.28.28071 en Indiana Univ. Math. J. 28 (1979) 985 - 992 state-of-the-art mathematics http://iumj.org/access/