@article{Cedzich:78217,
      author        = "Cedzich, C. and Geib, T. and Stahl, C. and Velazquez, L.
                       and Werner, A.H. and Werner, R.F.",
      title         = "{Complete homotopy invariants for translation invariant
                       symmetric quantum walks on a chain}",
      year          = "2018",
}