@article{MS2_1983__53_166871,
     author = {Pertti Mattila},
     title = {An integral inequality for capacities.},
     journal = {Mathematica Scandinavica},
     pages = {256--264},
     year = {1983},
     volume = {53},
     zbl = {0513.31006},
     url = {http://geodesic.mathdoc.fr/item/MS2_1983__53_166871/}
}