@article{CML_2013__5_1_73_0,
     author = {Pr\'eaux, Jean-Philippe},
     title = {Group {Extensions} with {Infinite} {Conjugacy} {Classes}},
     journal = {Confluentes Mathematici},
     pages = {73--95},
     publisher = {Institut Camille Jordan},
     volume = {5},
     number = {1},
     year = {2013},
     doi = {10.5802/cml.3},
     language = {en},
     url = {http://archive.numdam.org/articles/10.5802/cml.3/}
}