1. Convenient categories of smooth spaces;J Baez;Trans. Am. Math. Soc,2011
2. Differential Forms in Algebraic Topology
3. Lusternik-Schnirelmann category;O Cornea,2003
4. Exemples de groupes diff�ologiques: flots irrationnels sur le tore. (An example of diffeological groups: the irrational flow on the torus);P Donato;C. R. Acad. Sci,1985