Oh Ungjin, Lee Yeonchan, Choi Jaeseok, Yoon Yongbeum, Chang Byunghoon, Cha Jun-Min,
                           2016, Development of Reliability Contribution Function of Power System including Wind
                           Turbine Generators combined with Battery Energy Storage System, Transactions on KIEE,
                           Vol. 65, No. 3, pp. 371-381
