RAKOWSKI, Jerzy, and Przemyslaw WIELENTEJCZYK. “Isogeometric Approximation for Dynamics of Infinite String Using Difference Equation Method”. Engineering Transactions 64, no. 2 (February 24, 2016): 197–211. Accessed June 12, 2025. https://et3.ippt.pan.pl/index.php/et/article/view/302.