P. Kostrauskas, A. Kalvaitis, A. Degutis, and L. Andriušienė, “V-Characteristics Analysis of Non-Salient Pole Synchronous Electrical Machines”, ELEKTRON ELEKTROTECH, vol. 61, no. 5, pp. 14–22, May 2005, doi: 10.5755/j02.eie.10439.