It points to even older paper for ANS: http://arxiv.org/abs/0710.3861

The more recent one is: http://arxiv.org/abs/1311.2540

The first one is about kind of multidimensional analogue of Fibonacci coding ( https://en.wikipedia.org/wiki/Fibonacci_coding )- on a lattice, such that there cannot be two neighboring '1's. It also uses an interesting concept of Maximal Entropy Random Walk.