H^p-theory for generalized M-harmonic functions in the unit ball Patrick AhernJoaquim BrunaCarme Cascante Indiana University Mathematics Journal 1996 text pdf 10.1512/iumj.1996.45.1961 10.1512/iumj.1996.45.1961 en Indiana Univ. Math. J. 45 (1996) 103 - 136 state-of-the-art mathematics http://iumj.org/access/