@Book{BDG201892337377, title = "Elementos de c\'{a}lculo diferencial y de c\'{a}lculo integral", author = "Boucharlat, J.L", publisher = "Madrid : Imp. Real", editor = "Imp. Real", URL = "http://biblioteca.galiciana.gal/es/consulta/registro.do?id=341146", year = "1834", }