@book { Aproximacinfuncionalalosmarcadoresdiscursivos,
    title = "Aproximación funcional a los marcadores discursivos",
    author = "Ana {Llopis-Cardona}",
    year = "2014",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-03865-1",
    url = "https://www.peterlang.com/document/1048181"
}