1. V.I. Arnold, Topological Invariants of plane curves and caustics, AMS, Univ Lectures, vol.5, Providence,1994.

  2. 2. V.I. Arnold, Plane curves, their invariants, perestroikas and bifurcations. In: Singularities and bifurcations, Advances in Soviet Mathematics, Vol.21, AMS,Providence, 1994 .

  3. 3. V.I. Arnold, Sur les proprietes topologiques des projections Lagrangiennezs en geometrie symplectique des caustiques, Cahiers mathematiques de la decision,n°9320, CEREMADE, Universite Paris-Dauphine, 14:6:93, 9pp.

  4. 4. V.I. Arnold, On the topological properties of the Legendrian projections in the contact topology of wave fronts, Sanct Petersburg Math J., vol.6, n3, 1994, pp 1-16.

  5. 5. V.I. Arnold, On the flattening points numbers of space curves. Preprint ISSN IML 1103-467X ,ISRN IML-R -1-94/95, Report N1 1994/95, Institut Mittag- Leffler, 1994.,13pp.

  6. 6. V.I. Arnold, Geometry of spherical curves and algebra of quaternions, Russian Math. Surveys,50: 1(1995), 3-68.

  7. 7. V.I. Arnold, Invariants and perestoikas of plane wave fronts, Trudy Steklov Mathg Inst, 209(1995), 65 pp.

Steklov Mathematical Institute, Moscow and Universite Paris-Dauphine, Paris