@article{10_4064_cm_34_2_235_240,
     author = {B. Hajduk},
     title = {Presentations of the fundamental group of a manifold},
     journal = {Colloquium Mathematicum},
     pages = {235--240},
     publisher = {mathdoc},
     volume = {34},
     number = {2},
     year = {1975},
     doi = {10.4064/cm-34-2-235-240},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-34-2-235-240/}
}