@article{CMH_1957__32_139147,
     author = {C.D. Papakyriakopoulos},
     title = {On the {Ends} of the {Fundamental} {Groups} of {3-Manifolds} with {Boundary.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {85--92},
     publisher = {mathdoc},
     volume = {32},
     year = {1957},
     zbl = {0080.16805},
     url = {http://geodesic.mathdoc.fr/item/CMH_1957__32_139147/}
}