Before revision:  In this paper we considered the efficient hedging for European call option in general Black-Scholes model dX_t=X_t(m(t)dt+\sigma (t)dw(t)) with time-varying drift and volatility coefficients and in fractional Black-Scholes model dX_t=X_t( mdt+\sigma dB _H(t)  ) with constant coefficients.
After revision:  In this paper we considered the efficient hedging for European call option in general Black-Scholes model dX_t=X_t(m(t)dt+\sigma (t)dw(t)) with time-varying drift and volatility coefficients and in fractional Black-Scholes model dX_t=X_t( \sigma B _H(t) ) with constant coefficients.