"Frequenz", 52.7-8 (1998): 129-168. Retrieved 21 May. 2013, from http://www.degruyter.com/view/j/freq.1998.52.7-8/issue-files/freq.1998.52.7-8.xml

Frequenz (1998), 52(7-8), pp. 129-168. Retrieved 21 May. 2013, from http://www.degruyter.com/view/j/freq.1998.52.7-8/issue-files/freq.1998.52.7-8.xml

Frequenz. 1998. 52(7-8): 129-168. Retrieved 21 May. 2013, from http://www.degruyter.com/view/j/freq.1998.52.7-8/issue-files/freq.1998.52.7-8.xml