Ledger, P., Ainsworth, M., Coyle, J., Ledger, P., & Morgan, K. (2003). Computing maxwell eigenvalues by using higher order edge elements in three dimensions. IEEE Transactions on Magnetics, 39(5), pp. 2149-2153. doi:10.1109/TMAG.2003.817097

Ledger, Paul, M. Ainsworth, J. Coyle, P.D Ledger, and K. Morgan. "Computing Maxwell Eigenvalues By Using Higher Order Edge Elements in Three Dimensions." IEEE Transactions On Magnetics 39, no. 5 (2003): 2149-2153.

Ledger, Paul, et al. "Computing Maxwell Eigenvalues By Using Higher Order Edge Elements in Three Dimensions." IEEE Transactions On Magnetics 39.5 (2003): 2149-2153.