A Luzin Type Property of Sobolev Functions Fon-Che Liu Indiana University Mathematics Journal 1977 text pdf 10.1512/iumj.1977.26.26051 10.1512/iumj.1977.26.26051 en Indiana Univ. Math. J. 26 (1977) 645 - 651 state-of-the-art mathematics http://iumj.org/access/