Multiparameter Maximal Operators and Square Functions on Product Spaces Yonggeun Cho Indiana University Mathematics Journal 1994 text pdf 10.1512/iumj.1994.43.43019 10.1512/iumj.1994.43.43019 en Indiana Univ. Math. J. 43 (1994) 459 - 491 state-of-the-art mathematics http://iumj.org/access/