@article{HHA_2001_3_2_a3,
     author = {Gunnar Carlsson},
     title = {Introduction},
     journal = {Homology, homotopy, and applications},
     pages = {6--6},
     publisher = {mathdoc},
     volume = {3},
     number = {2},
     year = {2001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/HHA_2001_3_2_a3/}
}