@Book{RANME20161461038, title = "The effect on virulence of changes in parasite and host", author = "Andrewes, C H", publisher = "London : J. \& A. Churchill", editor = "J. \& A. Churchill", series = "(Ciba Foundation study group ; 4)", URL = "http://bibliotecavirtual.ranm.es/ranm/es/consulta/registro.do?id=48103", year = "1960", }