@article{10_4064_aa8154_12_2015,
     author = {Francesca Balestrieri},
     title = {Obstruction sets and extensions of groups},
     journal = {Acta Arithmetica},
     pages = {151--181},
     publisher = {mathdoc},
     volume = {173},
     number = {2},
     year = {2016},
     doi = {10.4064/aa8154-12-2015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa8154-12-2015/}
}