@article{GDZPPN002110504,
title = {Positive Lyapunov exponents in families of one dimensional dynamical systems.},
journal = {Inventiones mathematicae},
volume = {114},
year = {1993},
pages = {113-138},
zbl = {0787.58029},
url = {http://dml.mathdoc.fr/item/GDZPPN002110504}
}
Tsujii, Masato. Positive Lyapunov exponents in families of one dimensional dynamical systems.. Inventiones mathematicae, Tome 114 (1993) pp. 113-138. http://gdmltest.u-ga.fr/item/GDZPPN002110504/