References for generalized canonical commutation relations

[Ssnow]

Hi to all, I ask if somebody of the Physics community know good references for article where the author works with generalized canonical commutation relations ( I mean that the author works with $[x,p]=ic\hbar$ with $c$ a real constant instead of $[x,p]=i\hbar$).
Thank you for the answers,
Ssnow

 

[Demystifier]

There is a lot of literature with $c=1/\hbar$, they usually say that they work in units $\hbar=1$.