@book{ title = "Tropen zum Proprium Missarum", author = "Blume, Clemens", year = "1906", publisher = "Reisland", address = "Leipzig", language = "lat","ger", howpublished = "print", keywords = "Proprium,Messe,Sequenz", series = "Tropi graduales = Tropen des Missale im Mittelalter / hrsg. von Clemens Blume ..., 2", series = "Analecta hymnica medii aevi, 49", }