@article{SIGMA_2023_19_a52,
     author = {Chris Bourne},
     title = {Index {Theory} of {Chiral} {Unitaries} and {Split-Step} {Quantum} {Walks}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2023},
     volume = {19},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2023_19_a52/}
}