Possibly stupid question, in general: why don't these papers have any dates? how do I know when it was published and whether it is up-to-date / still relevant?
replies(2):
The nice part is that this information is standardized through the digital object identifier (doi).
Ex: 10.14778/3611479.3611527
This doi takes you to:
https://dl.acm.org/doi/10.14778/3611479.3611527
In general if you have a DOI and you want a URL you can go to https://dx.doi.org/ to resolve it.