@article{10_2140_agt_2002_2_37,
     author = {Leininger, Christopher J and Reid, Alan W},
     title = {The co-rank conjecture for 3{\textendash}manifold groups},
     journal = {Algebraic and Geometric Topology},
     pages = {37--50},
     year = {2002},
     volume = {2},
     number = {1},
     doi = {10.2140/agt.2002.2.37},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2002.2.37/}
}