1. Arnol’d, V.I., Gusein-Zade, S.M., Varchenko, A.N.: Singularities of Differentiable Maps. Vol. I. The Classification of Critical Points, Caustics and Wave Fronts, Translated from the Russian by Ian Porteous and Mark Reynolds. Monographs in Mathematics, vol. 82 (1985)
2. Banchoff, T., Gaffney, T., McCrory, C.: Cusps of Gauss Mappings. Pitman Books Limited, London (1982). Web version with D. Dreibelbis www.math.brown.edu/~dan/cgm/index.html
3. Bruce, J.W., Giblin, P.J., Tari, F.: Families of surfaces: height functions, Gauss maps and duals. In: Marar, W.L. (Ed.) Real and Complex Singularities, Pitman Research Notes in Mathematics, vol. 333, pp. 148–178 (1995)
4. Bleecker, D., Wilson, L.: Stability of Gauss maps. Ill. J. Math. 22(2), 279–289 (1978)
5. Camacho, C., Lins Neto, A.: Geometric Theory of Foliations. Birkhäuser, Boston (1985)