@article{MOMA_1993__115_4_178609,
     author = {K. Hag and K. Astala and P. Hag and V. Lappalainen},
     title = {Lipschitz {Classes} and the {Hardy-Littlewood} {Property.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {267--280},
     publisher = {mathdoc},
     volume = {115},
     number = {4},
     year = {1993},
     zbl = {0782.30002},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1993__115_4_178609/}
}