Tolong jelaskan mengenai Rujukan dari Penghalang beta dalam bahasa melayu

Musicians and beta-blockers by Gerald Klickstein, March 11, 2010 (A blog post that considers "whether beta-blockers are safe, effective, and appropriate for performers to use.")

Better Playing Through Chemistry by Blair Tindall, The New York Times, October 17, 2004. (Discusses the use of beta blockers among professional musicians)

Musicians using beta blockers by Blair Tindall. Condensed version of above article.

In Defense of the Beta Blocker by Carl Elliott, The Atlantic, August 20, 2008. (Discusses the use of propranolol by a North Korean pistol shooter in the 2008 Olympics)