CP violation due to multi-Froggatt–Nielsen fieldsShinya Kanemura, Koichi Matsuda, Toshihiko Ota, Serguey Petcov, Tetsuo Shindou, Eiichi Takasugi and Koji TsumuraEur. Phys. J. C, 51 4 (2007) 927-931DOI: https://doi.org/10.1140/epjc/s10052-007-0343-2