@article{GT_2007_11_2_a7,
     author = {Klein, John R and Williams, E Bruce},
     title = {Homotopical intersection theory {I}},
     journal = {Geometry & topology},
     pages = {939--977},
     publisher = {mathdoc},
     volume = {11},
     number = {2},
     year = {2007},
     doi = {10.2140/gt.2007.11.939},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/gt.2007.11.939/}
}