There's a copy of the first paper available at:

https://www.scribd.com/doc/166556276/Benter

If you're interested in those two papers, the earlier paper 'Searching for Positive Returns at the Track: A Multinomial Logit Model for Handicapping Horse Races' (Bolton, Ruth N. and Randall G. Chapman) is also worth reading:

http://www.ruthnbolton.com/Publications/Track.pdf

I've found that many conference "papers" were never actually written as papers at all, they were just oral presentations at a conference. Someone who was there cites it in a paper of their own, and then a bunch of other people copy the citation without actually having seen/read the "paper".

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

Edit: there's a 2008 version or reprint of the first paper: https://www.worldscientific.com/doi/abs/10.1142/978981281919...

> 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.