@article{AFM_1994_19_2_a0,
     author = {A. Hinkkanen and G. J. Martin},
     title = {Abelian nondiscrete convergence groups in the plane },
     journal = {Annales Fennici Mathematici},
     pages = {205--246},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {1994},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AFM_1994_19_2_a0/}
}