Spectrum-Constrained and Skip-Enhanced Graph Fraud Detection: Addressing Heterophily in Fraud Detection with Spectral and Spatial Modeling. - Ijeoma Amuche Chikwendu; Xiaoling Zhang; Chiagoziem Chima Ukwuoma; Okechukwu C. Chikwendu; Yeong Hyeon Gu; Mugahed A. Al-antari (Symmetry, 2025)