Dennis Estes Leonard M. Adleman Kireeti Kompella Kevin S. McCurley Gary L. Miller Breaking the Ong-Schnorr-Shamir Signature Scheme for Quadratic Number Fields. 3-13 http://dx.doi.org/10.1007/3-540-39799-X_1 1985 conf/crypto/1985 CRYPTO db/conf/crypto/crypto85.html#EstesAKMM85