@article{EXMATH_1992_1992_1_a36,
     author = {Monta\~na, Jos\'e Luis and Pardo, Luis M. and Ramanakoraisina, R.},
     title = {Cotas inferiores para aproximaciones.},
     journal = {Extracta mathematicae},
     pages = {65-67},
     publisher = {mathdoc},
     volume = {7},
     number = {1},
     year = {1992},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_1992_1992_1_a36/}
}