Addenda ``The Conormal Derivative Problem for Nonuniformly Parabolic Equations'' Vol. 37 (1988), 23-72 Gary Lieberman Indiana University Mathematics Journal 1990 text pdf 10.1512/iumj.1990.39.39015 10.1512/iumj.1990.39.39015 en Indiana Univ. Math. J. 39 (1990) 279 - 281 state-of-the-art mathematics http://iumj.org/access/