@article{AFM_1979_4_1_a4,
     author = {Pertti Mattila},
     title = {Densities of measures on the real line},
     journal = {Annales Fennici Mathematici},
     pages = {53--61},
     publisher = {mathdoc},
     volume = {4},
     number = {1},
     year = {1979},
     doi = {10.5186/aasfm.1978-79.0414},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1978-79.0414/}
}