Michele Mosca Artur Ekert The Hidden Subgroup Problem and Eigenvalue Estimation on a Quantum Computer. 174-188 1998 conf/qcqc/1998 QCQC http://link.springer.de/link/service/series/0558/bibs/1509/15090174.htm db/conf/qcqc/qcqc1998.html#MoscaE98