The publication mentions another serial but it is not clear what relationship exists between the two serials

A record is found online whose title is similar but it is unclear whether the two titles are really related

A record is found online which appears to be related sequentially to the title being cataloged but there are no dates in the record and it is unclear whether the publication preceded or succeeded the publication being cataloged or whether there have been intervening changes.

See also:

14.4. When not to link