### BibTeX entry

@article{Fomin2001,
abstract = {A composition of birational maps given by Laurent polynomials need not be given by Laurent polynomials; however, sometimes---quite unexpectedly---it does. We suggest a unified treatment of this phenomenon, which covers a large class of applications. In particular, we settle in the affirmative a conjecture of D.Gale and R.Robinson on integrality of generalized Somos sequences, and prove the Laurent property for several multidimensional recurrences, confirming conjectures by J.Propp, N.Elkies, and M.Kleber.},
author = {Fomin, Sergey and Zelevinsky, Andrei},
month = {apr},
pages = 21,
title = {The Laurent phenomenon},
url = {http://arxiv.org/abs/math.CO/0104241},
year = 2001,
urldate = {2013-10-09}
}