5Gheorghi?? Zb?ganu,Xing Wu Zhuang. Two-parameter filtrations with respect to which all martingales are strong[J] 1982,Zeitschrift für Wahrscheinlichkeitstheorie und Verwandte Gebiete(4):437~452
6R. Cairoli,John B. Walsh. Stochastic integrals in the plane[J] 1975,Acta Mathematica(1):111~183