@article{10_2307_2661353,
     author = {O.S. Kozlovski},
     title = {Getting rid of the negative {Schwarzian} derivative condition},
     journal = {Annals of mathematics},
     year = {2000},
     volume = {152},
     number = {3},
     doi = {10.2307/2661353},
     zbl = {0988.37044},
     url = {http://geodesic.mathdoc.fr/articles/10.2307/2661353/}
}