Michail Zak Colin P. Williams Quantum Recurrent Networks for Simulating Stochastic Processes. 75-88 1998 conf/qcqc/1998 QCQC http://link.springer.de/link/service/series/0558/bibs/1509/15090075.htm db/conf/qcqc/qcqc1998.html#ZakW98