...
The dynamic nature of serials makes serial cataloging an exceptionally intricate and complex task. The title proper, numbering, and frequency of issuance may change multiple times over the life of the serial. Core elements are not always ascertainable from the primary source of information but accessible from other approved sources. Related works (supplements and special issues ) are sometimes issued with the main serial, and the body responsible for the serial may function as the creator or simply the publisher and issuing body.
...