The paper “An Algebraic Approach to the Control of Decentralized Systems” by me and Sanjay Lall will appear in the December 2014 issue of the IEEE Transactions on Control of Network Systems. The paper describes a purely algebraic treatment of the notion of quadratic invariance, which can be used to analyze decentralized control problems. This new viewpoint is powerful because it allows one to work with rational transfer functions, for example, without the need for an underlying topology or norm. A more spaced-out and legible version of the paper is also available on arXiv, and the final published version of the paper is available here.