@article{BBHMWZA09,
author = {Bostan, A. and Boukraa, S. and Hassani, S. and Maillard,
J.-M. and Weil, J.-A. and Zenine, N. and Abarenkova, N.},
title = {Renormalization, isogenies and rational symmetries of
differential equations},
journal = {Advances in Mathematical Physics},
number = {ID 941560},
pages = {44pp},
year = {2010},
arxiv = {abs/0911.5466},
abstract = {We give an example of infinite order rational
transformation that leaves a linear differential equation covariant. This
example can be seen as a non-trivial but still simple illustration of an
exact representation of the renormalization group.},
}