@article{MAN_1989__285_1_164603,
     author = {Michael Cowling and Gero Fendler},
     title = {Variants of {Littlewood-Paley} theory.},
     journal = {Mathematische Annalen},
     pages = {333--342},
     publisher = {mathdoc},
     volume = {285},
     number = {1},
     year = {1989},
     zbl = {0662.43003},
     url = {http://geodesic.mathdoc.fr/item/MAN_1989__285_1_164603/}
}