@article{GT_2003_7_1_a11,
     author = {Dunfield, Nathan M and Thurston, William P},
     title = {The virtual {Haken} conjecture: {Experiments} and examples},
     journal = {Geometry & topology},
     pages = {399--441},
     publisher = {mathdoc},
     volume = {7},
     number = {1},
     year = {2003},
     doi = {10.2140/gt.2003.7.399},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/gt.2003.7.399/}
}