Bolatov, A., Riabinin, A., Kornilov, N., Veprikov, A., Horváth, S., Takáč, M., & Beznosikov, A. (2026). LionMuon: Alternating Spectral and Sign Descent for Efficient Training. https://omanscience.com/en/articles/lionmuon-alternating-spectral-and-sign-descent-for-efficient-training