On the Area Integral, Carleson Measures and H^p in the Polydisc Kent Merryfield Indiana University Mathematics Journal 1985 text pdf 10.1512/iumj.1985.34.34035 10.1512/iumj.1985.34.34035 en Indiana Univ. Math. J. 34 (1985) 663 - 685 state-of-the-art mathematics http://iumj.org/access/