This service has been available since the release of IDA Version 3.0, in December 1999. In cooperation with the Infrared Processing and Analysis Center, (IPAC, USA), all major astronomical journals are read for references to ISO. Later on, astronomers at the ISO Data Centre find the specific observations (TDTs) on which the paper is based. This process sometimes involves interaction with the authors, when they are not explicitely mentioned in the paper. The observation details are then entered into IDA, via a dedicated web page called from IDA itself. Paper authors can also enter directly the observations used in their paper using the same system. Further to validation by the IDC, these are entered in IDA. Links between ISO observations and related articles are available in both directions as described in the following section.