On codimension one submersions of euclidean spaces. Antonio F. Costa, F.G. Gascon (1988) Inventiones mathematicae
On some components of moduli space of surfaces of general type Marco Manetti (1994) Compositio Mathematica
On the Homotopy Type of Certain Spaces of Differentiable Maps. Vagn Lundsgaard Hansen (1972) Mathematica Scandinavica
One-parameter submonoids in locally complete differentiable monoids Mitch Anderson (1980) Colloquium Mathematicae