Brzezniak, Zdzislaw; van Neerven, Jan M. A. M.; Veraar, Mark C.; Weis, Lutz (2008). "Ito's formula in UMD Banach spaces and regularity of solutions of the Zakai equation". Journal of Differential Equations. 245 (1): 30–58. arXiv:0804.0302. doi:10.1016/j.jde.2008.03.026.
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Brzezniak, Zdzislaw; van Neerven, Jan M. A. M.; Veraar, Mark C.; Weis, Lutz (2008). "Ito's formula in UMD Banach spaces and regularity of solutions of the Zakai equation". Journal of Differential Equations. 245 (1): 30–58. arXiv:0804.0302. doi:10.1016/j.jde.2008.03.026.