Kompiš, V., & 		Štiavnicky, M.
(2022).
 Trefftz functions in FEM, BEM and meshless methods.
<em>Computer Assisted Methods In Engineering And Science, 13</em>(3), 417- 426.
Retrieved from <a href="https://cames.ippt.pan.pl/index.php/cames/article/view/943" target="_new">https://cames.ippt.pan.pl/index.php/cames/article/view/943</a>