H. Nakajima et S. Furui, A NEW ALGORITHM OF LANGEVIN SIMULATION AND ITS APPLICATION TO THE SU(2) AND SU(3) LATTICE GAUGE, Nuclear physics. B, Proceedings supplement, 63, 1998, pp. 976-978
The 2nd order Runge-Kutta scheme Langevin simulation of unquenched QCD
in pseudofermion method derived from our general theory shows a behav
iour as a function of the Langevin step t better than the Fukugita,Oya
nagi,Ukawa's scheme.