@article{10_4064_cm4939_6_2016,
     author = {Sheldy Ombrosi and Carlos P\'erez},
     title = {Mixed weak type estimates: {Examples} and counterexamples related to a problem of {E.} {Sawyer}},
     journal = {Colloquium Mathematicum},
     pages = {259--272},
     publisher = {mathdoc},
     volume = {145},
     number = {2},
     year = {2016},
     doi = {10.4064/cm4939-6-2016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm4939-6-2016/}
}