GREITHER, Cornelius and
Radan KUČERA. The lifted root number conjecture for fields of prime degree over the rationals: an approach via trees and Euler systems.
Annales de l'Institut Fourier. Grenoble: Université Joseph Fourier Grenoble, 2002, vol. 52, No 3, p. 735-777. ISSN 0373-0956.