Muro, Fernando Max Planck Institute for Mathematics, Max Planck Society;
Lasheras, Francisco F. Max Planck Institute for Mathematics, Max Planck Society;
Muro, F., Cárdenas, M., Lasheras, F. F., & Quitero, A. (2005). Proper L-S category, fundamental pro-groups and 2-dimensional proper co-H-spaces. Topology and its Applications, 153(4), 580-604.