David Biron Ofer Biham Eli Biham Markus Grassl Daniel A. Lidar Generalized Grover Search Algorithm for Arbitrary Initial Amplitude Distribution. 140-147 1998 conf/qcqc/1998 QCQC http://link.springer.de/link/service/series/0558/bibs/1509/15090140.htm db/conf/qcqc/qcqc1998.html#BironBBGL98