Some of them discuss BCS rankings, so that's not all that helpful except as it relates to polls still used that were included in the BCS rankings historically.

https://www.jacksonville.com/story/sports/college/2010/01/17/unf-study-ap-college-football-poll-voters-show-regional-bias/15959104007/

https://econ.berkeley.edu/sites/default/files/Brent%20Hensley%20Honors%20Thesis.pdf

https://www.researchgate.net/publication/4960163_The_forecasting_accuracy_and_determinants_of_football_rankings