@article{10_1090_S0894_0347_04_00463_1,
     author = {van Strien, Sebastian and Vargas, Edson},
     title = {Real bounds, ergodicity and negative {Schwarzian} for multimodal maps},
     journal = {Journal of the American Mathematical Society},
     pages = {749--782},
     publisher = {mathdoc},
     volume = {17},
     number = {4},
     year = {2004},
     doi = {10.1090/S0894-0347-04-00463-1},
     url = {http://geodesic.mathdoc.fr/articles/10.1090/S0894-0347-04-00463-1/}
}