@book { PSAVigoOpelBochumComparacindedosciudadesysuspilareseconmicos,
    title = "PSA Vigo - Opel Bochum - Comparación de dos ciudades y sus pilares económicos",
    author = "Gabriel {Rivas Perez}",
    year = "2006",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783638503570",
    url = "https://www.hausarbeiten.de/document/55406"
}