@article{10_4153_CMB_2002_044_5,
     author = {Ledet, Arne},
     title = {On the {Essential} {Dimension} of {Some} {Semi-Direct} {Products}},
     journal = {Canadian mathematical bulletin},
     pages = {422--427},
     year = {2002},
     volume = {45},
     number = {3},
     doi = {10.4153/CMB-2002-044-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2002-044-5/}
}