R. M. Hafez, M. A. . Abdelkawy, Y. H. . Youssri, and . A. . Biswas, “Spectral Bernoulli-Gauss Collocation Scheme for Pantograph-Type Volterra Integro-Differential Equations”, Contemp. Math., vol. 7, no. 2, pp. 1553–1571, Feb. 2026.