"Frequenz", 52.3-4 (1998): 53-88. Retrieved 18 May. 2013, from http://www.degruyter.com/view/j/freq.1998.52.3-4/issue-files/freq.1998.52.3-4.xml

Frequenz (1998), 52(3-4), pp. 53-88. Retrieved 18 May. 2013, from http://www.degruyter.com/view/j/freq.1998.52.3-4/issue-files/freq.1998.52.3-4.xml

Frequenz. 1998. 52(3-4): 53-88. Retrieved 18 May. 2013, from http://www.degruyter.com/view/j/freq.1998.52.3-4/issue-files/freq.1998.52.3-4.xml