1. Abramowitz, M., Stegun, I.A. (eds.): Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables. Reprint of the 1972 Edition. Dover, New York (1992)
2. Chan, H.-F., Fan, C.-M., Yeih, W.: Solution of inverse boundary optimization problem by Trefftz method and exponentially convergent scalar homotopy algorithm. CMC Comput. Mater. Continua 24, 125–142 (2011)
3. Chen, J.-T., Lee, Y.-T., Yu, S.-R., Shieh, S.-C.: Equivalence between the Trefftz method of fundamental solution for the annular Green’s function using the addition theoremand image concept. Eng. Anal. Bound. Elem. 33, 678–688 (2009)
4. Chen, J.-T., Wu, C.-S., Lee, Y.-T., Chen, K.-H.: On the equivalence of the Trefftz method and method of fundamental solutions for Laplace and biharmonic equations. Comput. Math. Appl. 53, 851–879 (2007)
5. Ciałkowski, M., Grysa, K.: Trefftz method in solving the inverse problems. J. Inverse Ill-Posed Probl. 18, 595–616 (2010)