I want to do research about the evolution of ants, from the oldest confirmed fossils / genetic clocking etc. to modern times. I have found a few papers, but how can I confirm if the papers I found are still valid and not outdated?

I want to do research about the evolution of ants, from the oldest confirmed fossils / genetic clocking etc. to modern times. I have found a few papers, but how can I confirm if the papers I found are still valid and not outdated?