Nils Holger Petersen has published in the fields of medieval liturgy and drama, early modern rituals, medievalism, opera, music and theology. Jointly authored with Dr Eyolf Østrem: Medieval Ritual and Early Modern Music (Turnhout: Brepols, 2008). For a full list of publications, see http://www.teol.ku.dk/english/staff/profile/?id=152085&f=3