@article{AM_2000_152_3_a2,
     author = {O.S. Kozlovski},
     title = {Getting rid of the negative {Schwarzian} derivative condition},
     journal = {Annals of mathematics},
     publisher = {mathdoc},
     volume = {152},
     number = {3},
     year = {2000},
     url = {http://geodesic.mathdoc.fr/item/AM_2000_152_3_a2/}
}