@article{JEMS_2017_19_7_a2,
     author = {Istv\'an Heckenberger and Leandro Vendramin},
     title = {The classification of {Nichols} algebras over groups with finite root system of rank two},
     journal = {Journal of the European Mathematical Society},
     pages = {1977--2017},
     publisher = {mathdoc},
     volume = {19},
     number = {7},
     year = {2017},
     doi = {10.4171/jems/711},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/711/}
}