1. 1.Lakhtakia, A. (Ed.), Essays of Formal Aspects of Electromagetic Theory, World Scientific, Singapore, 1993.
2. 2.Turowski, J., “Three‐phase transformers. New problem proposed for future TEAM Workshop on 3‐D electromagnetic field analysis”, COMPEL ‐ The International Journal for Computation and Mathematics in Electrical Engineering, Vol. 9, Supplement A, 1990, pp 167‐70.
3. 3.Kazmierski, M., “Estimating approximate methods in the analysis of electromagnetic fields in transformers” (in Polish), Rozprawy Elektrotechniczne, Vol. 16 No. 1, 1970, pp. 3‐26.
4. 4.Preston, T.W. and Reece, A.B.J., The Finite‐Element Contribution to Electrical Machine Design, GEC Engineering, No. 2, 1984.
5. 5.Coulson, M.A., Preston, T.W. and Reece, A., “3‐dimensional finite element solvers for the design of electrical equipment”, COMPUMAG’85 Conference, Fort Collins, USA, 1985.