[paper] Deep learning in neural networks: an overview

Link to the paper: http://arxiv.org/abs/1404.7828

It's a good and information rich overview of the deep learning research area. It has plenty of contents well organized in the chronological order, which is reflected by the 40 out of totally 60 pages' references.

It also has a line or two mentioning about the HTM, which I am interested in exploring.