1. Blondel, A.: ‘The Methods of Calculation of the Armature Reactions (Direct and Transverse) of Alternators’, Transactions of the International Electrical Congress, St. Louis 1904),1, p. 635
2. Liwschitz-Garik, M., and Whipple, C.: Electrical Machinery, (van Nostrand, New York 1946),2,