1. Kov�cs, K. P.; R�cz, I.: Transiente Vorg�nge in Wechselstrommaschinen. Budapest: Akad�mia Kiad� 1954
2. Kov�cs, K. P.: Transient Processes in ac Machines. Budapest: Akad�mia Kiad� 1980
3. Vas, P.: A Generalized Theory of Electrical Machines. Elektrotechnika 73 (1980)
4. Putman, H. V.: Synchronizing Power in Synchronous Machines Under Steady-State and Transient Conditions. AIEE Transaction 45 (1925) 1116?1124
5. Kilgore, L. A.: Calculation of Synchronous Machine Constants-Reactances and Time Constant Effecting Transient Characteristics. AIEE Transactions on Power Apparatus and Systems PAS-50 (1931) 1201?1213