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@article{AFM_1976_2_1_a8, author = {Lipman Bers}, title = {Nielsen extensions of {Riemann} surfaces}, journal = {Annales Fennici Mathematici}, pages = {29--34}, publisher = {mathdoc}, volume = {2}, number = {1}, year = {1976}, doi = {10.5186/aasfm.1976.0205}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1976.0205/} }
Lipman Bers. Nielsen extensions of Riemann surfaces. Annales Fennici Mathematici, Tome 2 (1976) no. 1, pp. 29-34. doi : 10.5186/aasfm.1976.0205. http://geodesic.mathdoc.fr/articles/10.5186/aasfm.1976.0205/
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