@article{antieau_ovchinnikov_trushin_2014, 
  title={Galois Theory of Difference Equations with Periodic Parameters}, 
  volume={42}, 
  DOI={10.1080/00927872.2013.797991}, 
  publisher={Informa UK Limited}, 
  author={Antieau and Ovchinnikov and Trushin}, 
  year={2014}, 
  month={Apr}
  }