Armitage, N. P.Damascelli, A.Feng, D. L.Lu, D. H.Shen, K. M.2004-12-142004-12-1420012001http://hdl.handle.net/2003/1916410.17877/DE290R-1834enThe American Physical SocietyPhysical Review Letters530Superconducting Gap and Strong In-Plane Anisotropy in Untwinned YBa2Cu3O7–delta10.1103/PhysRevLett.86.4370article (journal)