@article{STNG_1978-1979__7__A4_0,
     author = {Robert, Gilles},
     title = {Une curieuse sym\'etrie des unit\'es elliptiques},
     journal = {S\'eminaire de th\'eorie des nombres de Grenoble},
     note = {talk:4},
     pages = {1--20},
     publisher = {Institut des Math\'ematiques Pures - Universit\'e Scientifique et M\'edicale de Grenoble},
     volume = {7},
     year = {1978-1979},
     language = {fr},
     url = {http://www.numdam.org/item/STNG_1978-1979__7__A4_0/}
}