@article{1029002788,
author = {Halpern, Noemi},
title = {Some remarks on Nielsen extensions of Riemann surfaces.},
journal = {Michigan Math. J.},
volume = {30},
number = {1},
year = {1983},
pages = { 65-68},
language = {en},
url = {http://dml.mathdoc.fr/item/1029002788}
}
Halpern, Noemi. Some remarks on Nielsen extensions of Riemann surfaces.. Michigan Math. J., Tome 30 (1983) no. 1, pp. 65-68. http://gdmltest.u-ga.fr/item/1029002788/