A Schur-Horn-Kostant convexity theorem for the diffeomorphism group of the annulus. A.M. Bloch; H. Flaschka; T. Ratiu — 1993 Inventiones mathematicae
Dissipation Induced Instabilities A. M. Bloch; P. S. Krishnaprasad; J. E. Marsden; T. S. Ratiu — 1994 Annales de l'I.H.P. Analyse non linéaire