I am looking for an adjective that describes something as "less noticed."
For example, a piece of work in literature that is "less noticed" by many contemporary people, or some important work that would have deserved to be noticed by many people, but wasn't.
I don't mean something ignored or undervalued; rather, something "not getting enough attention." For example, an important piece of work in literature that, despite its importance, has not been cited enough, because many people are not aware of it.
An example: The work by John Doe is an important contribution to the Theory of Evolution, but it is less noticed in literature.