@book { UnaComparacindelossistemasdepartidosenEspaayenAlemania,
    title = "Una Comparación de los sistemas de partidos en España y en Alemania",
    author = "David Christoph {Lerch}",
    year = "2005",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638402279",
    url = "https://www.hausarbeiten.de/document/42118"
}