On boundary regularity for one-sided locally solvable vector fields S. BerhanuJorge Hounie 35F1535B3042B3042A3830E25weak boundary valueslocally integrable vector fieldsHardy spacesF. and M. Riesz property Indiana University Mathematics Journal 2003 text pdf 10.1512/iumj.2003.52.2418 10.1512/iumj.2003.52.2418 en Indiana Univ. Math. J. 52 (2003) 1447 - 1477 state-of-the-art mathematics http://iumj.org/access/