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  https://www.math.kth.se/na/DN2281/stodiff14/Lecture_2.pdf
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Ito ºÍ Stratonovich »ý·ÖÊÇ stochastic integrals, ºÍÒ»°ã Riemann sum integrals ²»Í¬  [ͼ2]
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  https://www.caam.rice.edu/~cox/stoch/dhigham.pdf
  https://www.math.kth.se/~szepessy/sdepde.pdf
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