@book { Ncleos,
    title = "Núcleos",
    author = "Hugo Egardo {Lombardini} and Maria Enriqueta {Perez Vazquez}",
    year = "2012",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    doi = "10.3726/978-3-0351-0530-8",
    url = "https://www.peterlang.com/document/1052985"
}