Baumann, B, M Wolff, B Kost, and H Groninga. “Solving a Coupled Field Problem by Eigenmode Expansion and Finite Element Method”. The International Journal of Multiphysics 1, no. 3 (September 30, 2007): 303-316. Accessed October 5, 2025. https://themultiphysicsjournal.com/index.php/ijm/article/view/1-3-303.