Hardy space estimates for bilinear square functions and Calderon-Zygmund operators Jarod HartGuozhen Lu Indiana University Mathematics Journal 2016 text pdf 10.1512/iumj.2016.65.5898 10.1512/iumj.2016.65.5898 en Indiana Univ. Math. J. 65 (2016) 1567 - 1607 state-of-the-art mathematics http://iumj.org/access/