Arkkio, A. (1987), "Analysis of induction motors based on the numerical solution of the magnetic field and circuit equations", Acta Polytechnica Scandinavica, p. 56.
Bossavit, A. (1988), "Whitney forms: a class of finite elements for 3D computations in electromagnetism", ZEE Proceedings, Part A, Vol. 135 No. 8, pp. 493-500.
Coulomb, J.L. (1983), "A methodology for the determination of global electromechanical quantities from a finite element analysis and its application to the evaluation of magnetic forces, torques and stiffness", IEEE Transactions on Magnetics, Vol. 19 No. 6, pp. 2514-19.
Schutz, B. (1980), Geometrical Methods of Mathematical Physics, Cambridge University Press, Cambridge.