@article{MS2_1977__41_166547,
     author = {Svante Janson},
     title = {Characterisations of {H...} by singular intetgral transforms on martingales and {R...}},
     journal = {Mathematica Scandinavica},
     pages = {140--152},
     publisher = {mathdoc},
     volume = {41},
     year = {1977},
     zbl = {0369.42005},
     url = {http://geodesic.mathdoc.fr/item/MS2_1977__41_166547/}
}