Abstract
Our objective with this essay is to describe a way to build germs of applications A-finite f:(\C^{n},0) \rightarrow (\C^{p},0) for p=2n and p=2n-1. In the case p<2n-1, we conclude that there is no germ of reflection application A-finite f:(\C^{n},0) \rightarrow (\C^{p},0) with corank f greater or equal 2.