Characterisations of $H^1$ by singular intetgral transforms on martingales and $\mathsf{R}^n$

Janson, S. (1977). Characterisations of $H^1$ by singular intetgral transforms on martingales and $\mathsf{R}^n$. MATHEMATICA SCANDINAVICA, 41, 140–152. https://doi.org/10.7146/math.scand.a-11708