> I found the second paper behind a paywall: https://www.researchgate.net/publication/299438463_Advances_....

I don't believe that's a paywall, just Researchgate being scummy like usual and using a citation while pretending to have a copy - all that would do is ping Benter to ask for a copy. I can't find any evidence that that conference presentation was published or that the conference proceedings as a whole were ever published.