V. Ravoson

Separability and Lax pairs for Hénon–Heiles system

V. Ravoson, L. Gavrilov, R. Caboz, 1993 .

Generalized separability for a Hamiltonian with nonseparable quartic potential

A. Ramani, B. Grammaticos, V. Ravoson, 1994 .

Coalescence of singularities and Ziglin's approach to nonintegrability

A. Ramani, B. Grammaticos, V. Ravoson, 1995 .