@Book{CYL20090065758, title = "Gram\'{a}tica hist\'{o}rica de la lengua castellana", author = "Hanssen, Federico, 1857-1919", publisher = "Halle : Max Niemeyer", editor = "Max Niemeyer", URL = "https://bibliotecadigital.jcyl.es/es/consulta/registro.do?id=7911", year = "1913", }