"Frequenz", 61.5-6 (2007): 105-144. Retrieved 23 May. 2013, from http://www.degruyter.com/view/j/freq.2007.61.5-6/issue-files/freq.2007.61.5-6.xml

Frequenz (2007), 61(5-6), pp. 105-144. Retrieved 23 May. 2013, from http://www.degruyter.com/view/j/freq.2007.61.5-6/issue-files/freq.2007.61.5-6.xml

Frequenz. 2007. 61(5-6): 105-144. Retrieved 23 May. 2013, from http://www.degruyter.com/view/j/freq.2007.61.5-6/issue-files/freq.2007.61.5-6.xml