Can anyone provide me with a basic reference on $A\_\infty$ categories? 



$A_\infty$-categories basic reference
I am currently trying to learn this, and [this paper](http://arxiv.org/abs/math/9910179) of B. Keller proved very useful. [This one](http://arxiv.org/abs/0809.4791) of J. Huebschmann seems a bit less basic, but might be usefull too. I must say I'm very interested in any other answers.


