Joubert, G. P., Moussu, R. P., Roussarie, R. H., Joubert, G. P., & Roussarie, R. H. (1975). Differential topology and geometry: Proceedings of the colloquium held at Dijon, 17-22 June, 1974. Berlin Heidelberg New York: Springer-Verlag.

Joubert, G. P., R. P. Moussu, Robert H. Roussarie, Gerard P. Joubert, and R. H. Roussarie. Differential Topology and Geometry: Proceedings of the Colloquium Held At Dijon, 17-22 June, 1974. Berlin Heidelberg New York: Springer-Verlag, 1975.

Joubert, G. P., et al. Differential Topology and Geometry: Proceedings of the Colloquium Held At Dijon, 17-22 June, 1974. Berlin Heidelberg New York: Springer-Verlag, 1975.