1. J.-P. Brasselet, Local Euler obstruction, old and new. XI Brazilian Topology Meeting (Rio Claro, 1998), 140–147, World Sci. Publishing, River Edge, NJ (2000).
2. J.-P. Brasselet and N.G. Grulha Jr., Local Euler obstruction, old and new II. London Mathematical Society — Lectures Notes Series 380 — Real and Complex Singularities, Cambridge University Press, (2010), 23–45.
3. J.-P. Brasselet and M.H. Schwartz, Sur les classes de Chern d’un ensemble analytique complexe. Astérisque, 82–83 (1981), 93–147.
4. J.-P. Brasselet, D. Massey, A. Parameswaran and J. Seade, Euler obstruction and defects of functions on singular varieties. Journal London Math. Soc. (2), 70(1) (2004), 59–76.
5. G. Gonzalez-Sprinberg, L’obstruction locale d’Euler et le Théorème de Mac-Pherson. Astérisque, 82–83 (1981), 7–32.