This article on controlling Poa annua in sports turf appeared in SPORTSTURF magazine in March of 2015. You can link to the original by going to: http://read.dmtmag.com/i/460594
Here is an article by Tim VanLoo, CSFM, sports turf manager for the Iowa State University Athletic Department. The title is "Environmental Conservations: One sports turf manager's story". It appeared in SportsTurf magazine in October 2014. You can view the article at http://read.dmtmag.com/i/391471/8.
Tim's contact information is:
Tim VanLoo, CSFM
Manager of Athletic Turf and Grounds
Iowa State University
1800 S. 4th Street
Ames, IA 50011