@article{10_4171_dm_145,
     author = {Giordano Favi and Gr\'egory Berhuy},
     title = {Essential dimension: {A} functorial point of view (after {A.} {Merkurjev)}},
     journal = {Documenta mathematica},
     pages = {279--330},
     year = {2003},
     volume = {8},
     doi = {10.4171/dm/145},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/dm/145/}
}