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We prove that $X_t$ satisfies the stochastic differential equation of the form $dX_t=(k-aX_t)dt+\\sigma\\sqrt{X_t}\\circ dB_t^H$, where the integral with respect to fractional Brownian motion is considered as the pathwise Stratonovich integral. 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We prove that $X_t$ satisfies the stochastic differential equation of the form $dX_t=(k-aX_t)dt+\\sigma\\sqrt{X_t}\\circ dB_t^H$, where the integral with respect to fractional Brownian motion is considered as the pathwise Stratonovich integral. 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