On the Total Variation of Solutions of Parabolic Equations E. Conway Indiana University Mathematics Journal 1972 text pdf 10.1512/iumj.1972.21.21039 10.1512/iumj.1972.21.21039 en Indiana Univ. Math. J. 21 (1972) 493 - 503 state-of-the-art mathematics http://iumj.org/access/