@article{AUM_2011_65_2_a9,
     author = {Chuaqui, Martin and Duren, Peter and Osgood, Brad},
     title = {On a theorem of {Haimo} regarding concave mappings},
     journal = {Annales Universitatis Mariae Curie-Sk{\l}odowska. Mathematica },
     publisher = {mathdoc},
     volume = {65},
     number = {2},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUM_2011_65_2_a9/}
}