1. S. Bettin, C. David, C. Delaunay, Families of elliptic curves with non-zero average root number, preprint, 2016.
2. Calculating root numbers of elliptic surfaces over Q;Connell;Manuscripta Math.,1994
3. Root numbers and ranks in positive characteristic;Conrad;Adv. Math.,2005
4. Les constantes des équations fonctionelles des fonctions L;Deligne,1973