Before revision: We consider explicit approximations for European put option prices within the stochastic Verhulst model with time-dependent parameters, where the volatility process follows the dynamics dV_t = \kappa_t (\theta_t - V_t) V_t dt + \lambda_t V_t dB_t.
After revision: We consider explicit approximations for European put option prices within the Stochastic Verhulst model with time-dependent parameters, where the volatility process follows the dynamics dV_t = \kappa_t (\theta_t - V_t) V_t dt + \lambda_t V_t dB_t.