@article{IM_1985__81_143267,
     author = {M.J. Dunwoody},
     title = {The accessibility of finitely presented groups.},
     journal = {Inventiones mathematicae},
     pages = {449--458},
     publisher = {mathdoc},
     volume = {81},
     year = {1985},
     zbl = {0572.20025},
     url = {http://geodesic.mathdoc.fr/item/IM_1985__81_143267/}
}