please find
M. A. Vorontsov and V. P. Sivokon, "Stochastic parallel-gradient-descent technique for high-resolution wave-front phase-distortion correction," J. Opt. Soc. Am. A 15, 2745-2758 (1998)
http://www.opticsinfobase.org/josaa/viewmedia.cfm?uri=josaa-15-10-2745&seq=0