Ziheng Chen 0002 Jin Huang 0010 Fabrizio Silvestri Yongfeng Zhang 0003 Hongshik Ahn Gabriele Tolomei Joint Factual and Counterfactual Explanations for Top-k GNN-based Recommendations. 26:1-26:26 2026 June 4 Trans. Recomm. Syst. 2 https://doi.org/10.1145/3731683 db/journals/tors/tors4.html#ChenHSZAT26 streams/journals/tors