1. The Doubly Fed Machine;Concordia;AIEE Trans.,1942
2. The inherent instability of induction motors under conditions of double supply;Prescott;J. of IEE,1958
3. Synchronizing and Damping Torques in Synchronous Machines;Gupta;Proc. IEE,1967
4. Concepts of Synchronous Machine Stability as Affected by Excitation Control;Demello;IEEE Trans, on Power Appar. a. Syst.,1969
5. Singular Perturbations of a General Boundary Value Problem;Chang;SIAM J. Math. Anal.,1972