@incollection{SB_1978-1979__21__244_0,
     author = {Deligne, P.},
     title = {Sommes de {Gauss} cubiques et rev\^etements de $SL(2)$},
     booktitle = {S\'eminaire Bourbaki : vol. 1978/79, expos\'es 525-542},
     series = {S\'eminaire Bourbaki},
     note = {talk:539},
     pages = {244--277},
     publisher = {Springer-Verlag},
     number = {21},
     year = {1980},
     mrnumber = {572428},
     zbl = {0433.10018},
     language = {fr},
     url = {http://archive.numdam.org/item/SB_1978-1979__21__244_0/}
}