F. B. I. Transformation. Second Microlocalization and Semilinear CausticsJean-Marc Delort.1992PDF27 MBEN
Singularities of Differentiable Maps: Volume I: The Classification of Critical Points Caustics and Wave FrontsV. I. Arnold, S. M. Gusein-Zade, A. N. Varchenko1985PDF21 MBEN