Uściłowska-Gajda, A., J . A. Kołodziej, M. Ciałkowski, & A. Frąckowiak. " Comparison of two types of Trefftz method for the solution of inhomogeneous elliptic problems." Computer Assisted Methods in Engineering and Science [Online], 10.4 (2003): 661- 675. Web. 23 Dec. 2024