@article{EXMATH_1999_1999_1_a13,
     author = {Epstein, Marcelo},
     title = {Evoluci\'on anel\'astica de materiales de segundo grado.},
     journal = {Extracta mathematicae},
     pages = {157-161},
     publisher = {mathdoc},
     volume = {14},
     number = {2},
     year = {1999},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_1999_1999_1_a13/}
}