@article{10_1017_S0017089508004874,
     author = {VIALLET, CLAUDE M.},
     title = {INTEGRABLE {LATTICE} {MAPS:} {QV,} {A} {RATIONAL} {VERSION} {OF} {Q4}},
     journal = {Glasgow mathematical journal},
     pages = {157--163},
     year = {2009},
     volume = {51},
     number = {A},
     doi = {10.1017/S0017089508004874},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089508004874/}
}