The five volumes are:
13 historier om den danske velfærdsstat (2003) [Histories on the Danish Welfare State
13 udfordringer til den danske velfærdsstat (2004) [Challenges to the Danish Welfare State
13 reformer af den danske velfærdsstat (2005) [13 Reforms of the Danish Welfare State]
13 løsninger for den danske velfærdsstat (2006) [13 Solutions for the Danish Welfare State]
13 Værdier bag den danske velfærdsstat (2007) [13 Values behind the Danish Welfare State]
You can read more about the volumes and download selected essays by clicking the links above. Please note that the essays are written in Danish.