1. ‘Unbalanced magnetic pull in a 6-pole, 10kW induction motor with a series-connected stator winding’, ERA Report, 5216, 1968
2. ‘Unbalanced magnetic pull in rotating electric machines: Survey of publised work’, ERA Report, Z/T142, 1963 p. 23–24
3. Schuisky, W.: Berechnung electrischer Maschinen, (Springer-Verlag, Vienna 1960), p. 387