TY  - JOUR
AU  - Masato Tsujii
TI  - Positive Lyapunov exponents in families of one dimensional dynamical systems.
JO  - Inventiones mathematicae
PY  - 1993
SP  - 113
EP  - 138
VL  - 111
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM_1993__111_1_144072/
ID  - IM_1993__111_1_144072
ER  -