TY - JOUR AU - Rohrlich, David E. TI - Variation of the root number in families of elliptic curves JO - Compositio Mathematica PY - 1993 SP - 119 EP - 151 VL - 87 IS - 2 PB - Kluwer Academic Publishers UR - http://www.numdam.org/item/CM_1993__87_2_119_0/ LA - en ID - CM_1993__87_2_119_0 ER -