1. C. Ehresmann, “Structures feuilletees,” Proc. Fifth Canad. Math. Congress. 70, 109–172 (1961).
2. G. Reeb, Sur certains proprietes topoloiques des varietes feuilletees (Actualite Sci Indust, 1968).
3. A. Haefliger, “Varietes feuilletees,” Ann. Scuola Norm. Sup. Pisa. 16, 367–397 (1962).
4. A list of questions about foliations
5. Lamoureux, “Feuilletages de codimension 1. transversales fermées,” (1970).