@incollection{AST_1979__66-67__33_0,
     author = {Po\'enaru, V.},
     title = {Rappels de g\'eom\'etrie hyperbolique en dimension $2$ et g\'en\'eralit\'es sur $i : \mathcal{S} \times \mathcal{S} \rightarrow \mathbb{R}_+$},
     booktitle = {Travaux de Thurston sur les surfaces - S\'eminaire Orsay},
     series = {Ast\'erisque},
     pages = {33--55},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {66-67},
     year = {1979},
     zbl = {0446.57007},
     language = {fr},
     url = {http://archive.numdam.org/item/AST_1979__66-67__33_0/}
}