Boros, Imre. “Accurate Chebyshev Collocation Solutions for the Biharmonic Eigenproblem on a Rectangle”. J. Numer. Anal. Approx. Theory 46, no. 1 (September 21, 2017): 38–46. Accessed July 3, 2024. https://ictp.acad.ro/jnaat/journal/article/view/1124.