@article{GDZPPN002308754,
title = {On the Homeotopy Groups of Surfaces.},
journal = {Mathematische Annalen},
volume = {201},
year = {1973},
pages = {1-22},
zbl = {0248.55001},
url = {http://dml.mathdoc.fr/item/GDZPPN002308754}
}
Zieschang, Heiner. On the Homeotopy Groups of Surfaces.. Mathematische Annalen, Tome 201 (1973) pp. 1-22. http://gdmltest.u-ga.fr/item/GDZPPN002308754/