@article{AIHPA_1990__53_4_427_0,
     author = {Nowicki, Tomasz and Van Strien, Sebastian},
     title = {Non-hyperbolicity and invariant measures for unimodal maps},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {427--429},
     publisher = {Gauthier-Villars},
     volume = {53},
     number = {4},
     year = {1990},
     mrnumber = {1096101},
     zbl = {0717.58037},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1990__53_4_427_0/}
}