@article{10_4171_ggd_217,
     author = {Risto Atanasov},
     title = {Geometric two-dimensional duality groups},
     journal = {Groups, geometry, and dynamics},
     pages = {69--95},
     year = {2014},
     volume = {8},
     number = {1},
     doi = {10.4171/ggd/217},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/217/}
}