@article{EXMATH_1999_1999_1_a25,
     author = {Kheldouni, Abdelaziz},
     title = {Sobre la dualidad de {Poincar\'e.}},
     journal = {Extracta mathematicae},
     pages = {247-266},
     publisher = {mathdoc},
     volume = {14},
     number = {3},
     year = {1999},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_1999_1999_1_a25/}
}