Uściłowska A, Kołodziej JA. Solution of the nonlinear equation for isothermal gas flows in porous medium by Trefftz method. Comp. Assist. Methods Eng. Sci. 2006;13(3):445-456. Accessed March 5, 2026. https://cames.ippt.gov.pl/index.php/cames/article/view/945