Find two references for a sentence

Job ID: 35923597

Budget: $10 – $11 CAD

I want you to find at least two references for below assertion:

"Most existing non-linear operations are derivations of activation functions that would be too simple and fail to incorporate enough non-linearity into a deep network, thus constraining the representational capacity of the deep network"

The references must be from a paper. Web pages are NOT acceptable.

What I need is the names of the papers and where you find the similar content.