title: Fourfold symmetry in the ab plane of the upper critical field for single-crystal Pb2Sr2Y0.62Ca0.38Cu3O8: Evidence for dx2-y2 pairing in a high-Tc superconductor.
authors.initials: Y
authors.lastname: Koike
authors.initials: T
authors.lastname: Takabayashi
authors.initials: T
authors.lastname: Noji
authors.initials: T
authors.lastname: Nishizaki
authors.initials: N
authors.lastname: Kobayashi