1. Normal forms of functions near degenerate critical points, Weyl groups, Ak, Dk, Ek and Lagrangian singularities;Arnold;Funct. Anal. Appl.,1972
2. Potential flows of collisionless particles, Lagrangian singularities and metamorphoses of caustics;Arnold,1982
3. Lagrangian manifolds with singularities, asymptotical rays and open swallowtail;Arnold;Funct. Anal. Appl.,1981
4. Multi-valued solutions and branch point singularities for non-linear hyperbolic or elliptic systems;Caflisch;Commun. Pure Appl. Math.,1993