Harmonic maps of the hyperbolic space and development of singularities in wave maps and Yang-Mills fields Thierry Cazenave, Jalal Shatah, A. Shadi Tahvildar-Zadeh (1998) Annales de l'I.H.P. Physique théorique
Hidden symmetries of integrable systems in Yang-Mills theory and Kähler geometry Kanehisa Takasaki (1990/1991) Séminaire Équations aux dérivées partielles (Polytechnique)