@article{EXMATH_1986_1986_1_a6,
     author = {Granja Bar\'on, Angel},
     title = {Bases de {Apery} e invariantes polares de singularidades curvas del plano.},
     journal = {Extracta mathematicae},
     pages = {9-11},
     year = {1986},
     volume = {1},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_1986_1986_1_a6/}
}