Higher-Order GNNs Meet Efficiency: Sparse Sobolev Graph Neural Networks. - Jhony H. Giraldo; Aref Einizade; Andjela Todorovic; Jhon A. Castro-Correa; Mohsen Badiey; Thierry Bouwmans; Fragkiskos D. Malliaros (IEEE Trans. Signal Inf. Process. over Networks, 2025)