@article{10_4064_sm_48_1_1_13,
     author = {Calixto Calder\'on},
     title = {Differentiation through starlike sets in $R^{m}$},
     journal = {Studia Mathematica},
     pages = {1--13},
     publisher = {mathdoc},
     volume = {48},
     number = {1},
     year = {1973},
     doi = {10.4064/sm-48-1-1-13},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-48-1-1-13/}
}