Partial Differential Equations, Orlicz Spaces, and Measure Functions Victor Shapiro Indiana University Mathematics Journal 1977 text pdf 10.1512/iumj.1977.26.26070 10.1512/iumj.1977.26.26070 en Indiana Univ. Math. J. 26 (1977) 875 - 883 state-of-the-art mathematics http://iumj.org/access/