The fund of serials with three levels of numbering is not displayed in the COBIB.SR online bibliographic catalogue/database uniformly for all libraries. This diminishes the principle of shared cataloguing as a uniformed display of library funds is definitely required to obtain precise information about where a certain publication can be found.
The paper focuses on the German shared catalogue for serials – ZDB. The ZDB catalogue (Zeitschriftendatenbank) includes titles and holdings of serials, enables the automation of serials cataloguing and facilitates interlibrary loan. It was founded in 1973 when it was sustained by only a small number of libraries.
With the advance of digital technology and consequently with the appearance of new media, serial publications subject has achieved previously unforeseen possibilities.
