Curvatures, Functionals, Currents G. AnzellottiR. SerapioniI. Tamanini Indiana University Mathematics Journal 1990 text pdf 10.1512/iumj.1990.39.39033 10.1512/iumj.1990.39.39033 en Indiana Univ. Math. J. 39 (1990) 617 - 669 state-of-the-art mathematics http://iumj.org/access/