RWTH Aachen University Institute of Electrical Machines. |access-date= requires |url= (help) Lynn, C. (1949). "§8-144 to §8-165 'Motor Characteristics and Regulation' in Sec.
RWTH Aachen University Institute of Electrical Machines.  |accessdate= вимагає |url= (довідка) Lynn, C. (1949). §8-144 to §8-165 'Motor Characteristics and Regulation' in Sec.