@article{TSG_1991-1992__10__93_0,
     author = {Greenberg, Peter},
     title = {Rapport sur la g\'eom\'etrie $SL_2 \mathbf {Z}$ par morceaux},
     journal = {S\'eminaire de th\'eorie spectrale et g\'eom\'etrie},
     pages = {93--95},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {10},
     year = {1991-1992},
     mrnumber = {1715916},
     zbl = {0786.52008},
     language = {fr},
     url = {http://www.numdam.org/item/TSG_1991-1992__10__93_0/}
}