2025 ICLR 2025 Spotlight Higher-Order Graphon Neural Networks: Approximation and Cut Distance Daniel Herbst, and Stefanie Jegelka International Conference on Learning Representations, Singapore, Feb 2025 PDF Spotlight 2024 NeurIPS 2024 Spatio-Spectral Graph Neural Networks Simon Geisler*, Arthur Kosmala*, Daniel Herbst, and Stephan Günnemann Advances in Neural Information Processing Systems, Vancouver, BC, Canada, Sep 2024 PDF Code