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IEEE Transactions on Power Apparatus and Systems IEEE Trans. Power Appar. Syst. Power Apparatus and Systems, IEEE Transactions on. PAS-91(5):2114-2124 Sep, 1972
IEEE Transactions on Power Apparatus and Systems IEEE Trans. Power Appar. Syst. Power Apparatus and Systems, IEEE Transactions on. PAS-92(1):154-158 Jan, 1973