"Das Rechenzentrum", 6.4 (1983): 199-268. Retrieved 20 May. 2013, from http://www.degruyter.com/view/j/piko.1.1983.6.issue-4/issue-files/piko.1.1983.6.issue-4.xml

Das Rechenzentrum (1983), 6(4), pp. 199-268. Retrieved 20 May. 2013, from http://www.degruyter.com/view/j/piko.1.1983.6.issue-4/issue-files/piko.1.1983.6.issue-4.xml

Das Rechenzentrum. 1983. 6(4): 199-268. Retrieved 20 May. 2013, from http://www.degruyter.com/view/j/piko.1.1983.6.issue-4/issue-files/piko.1.1983.6.issue-4.xml