201
Udgivet 1986
Full text available from Research Library: 01/01/1987 to 02/28/1990
Electronisk Tidsskrift
202
Udgivet 1984
Full text available from ABI/INFORM Dateline: 05/11/1987 to present
Electronisk Avis
203
Full text available from ABI/INFORM Global: 01/01/1993 to 10/31/2000
Government Document Electronisk Tidsskrift
205
209
Udgivet 2002
Full text available from Engineering Database: 01/01/2003 to 01/31/2004
Electronisk Tidsskrift