Washington Luiz Marar and David Mond, "Real map-germs with good perturbations", Topology 35 (1996), no. 1, 157--165.
David Mond, "How good are real pictures?", Algebraic geometry and singularities (La Rábida, 1991), 259--276, Progr. Math. 134, Birkhäuser, Basel, 1996.
David Mond, "Singularities of mappings from surfaces to 3-space", Singularity theory (Trieste, 1991), 509--526, World Sci. Publishing, River Edge, NJ (1995).
David Mond, "Some remarks on the geometry and classification of germs of maps from surfaces to 3-space", Topology 26 (1987), no. 3, 361--383.