@article{GT_2002_6_2_a10,
     author = {Agol, Ian},
     title = {Volume change under drilling},
     journal = {Geometry & topology},
     pages = {905--916},
     publisher = {mathdoc},
     volume = {6},
     number = {2},
     year = {2002},
     doi = {10.2140/gt.2002.6.905},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/gt.2002.6.905/}
}