1. “YBa2Cu3O7-x Josephson junctions and dc SQUIDs based on 45{} a-axis tilt and twist grain boundaries : atomically clean interfaces for applications”. Tafuri F, Carillo F, Lombardi F, Granozio FM, dii Uccio US, Testa G, Sarnelli E, Verbist K, Van Tendeloo G, Superconductor science and technologyT2 – International Superconductive Electronics Conference, JUN 21-25, 1999, BERKELEY, CALIFORNIA 12, 1007 (1999).   http://doi.org/10.1088/0953-2048/12/11/393