@Book{CYL20090030299, title = "Estudio sobre bocas de fuego", author = "Trujillo y Fern\'{a}ndez, Ferm\'{\i}n", publisher = "Segovia : [s.n.]", editor = "[s.n.]", URL = "https://bibliotecadigital.jcyl.es/es/consulta/registro.do?id=4437", year = "1900", }