@article{SM_1998_189_10_a4,
     author = {S. V. Matveev},
     title = {Generalized graph manifolds and their effective recognition},
     journal = {Sbornik. Mathematics},
     pages = {1517--1531},
     publisher = {mathdoc},
     volume = {189},
     number = {10},
     year = {1998},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1998_189_10_a4/}
}