Leitão, V.M. (2001) “Comparison of Galerkin and collocation Trefftz formulations for plane elasticity”, Computer Assisted Methods in Engineering and Science, 8(2-3), pp. 397–407. Available at: https://cames.ippt.gov.pl/index.php/cames/article/view/1178 (Accessed: 5 March 2026).