TY - JOUR AU - Guckenheimer, John TI - Catastrophes and partial differential equations JO - Annales de l'Institut Fourier PY - 1973 SP - 31 EP - 59 VL - 23 IS - 2 PB - Institut Fourier PP - Grenoble UR - http://archive.numdam.org/articles/10.5802/aif.455/ DO - 10.5802/aif.455 LA - en ID - AIF_1973__23_2_31_0 ER -