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