@article{GT_2000_4_1_a8,
     author = {Kuperberg, Greg},
     title = {Notions of denseness},
     journal = {Geometry & topology},
     pages = {277--292},
     publisher = {mathdoc},
     volume = {4},
     number = {1},
     year = {2000},
     doi = {10.2140/gt.2000.4.277},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/gt.2000.4.277/}
}