Functions of bounded higher variation R. JerrardH. Soner Indiana University Mathematics Journal 2002 text pdf 10.1512/iumj.2002.51.2229 10.1512/iumj.2002.51.2229 en Indiana Univ. Math. J. 51 (2002) 645 - 678 state-of-the-art mathematics http://iumj.org/access/