@book { Libertadencadenas,
    title = "Libertad en cadenas",
    author = "Aida {Beaupied}",
    year = "2011",
    publisher = "Peter Lang Verlag",
    address = "New York, United States of America",
    doi = "10.3726/978-1-4539-0011-6",
    url = "https://www.peterlang.com/document/1051003"
}