Perturbations of critical fixed points of analytic maps

Tischler, David

Astérisque, Complex analytic methods in dynamical systems - IMPA, January 1992, (1994) p. 407-422

A survey on the singularities and stability of differential forms

Golubitsky, Martin; Tischler, David

Astérisque, Journées singulières de Dijon, (1978) p. 43-82