Golf Ball Compression vs. Swing Speed - A Match Made In Heaven - The Expert Golf Website
TrackMan: Definitive Answers at Impact and More - TOM FIELDING GOLF SCHOOLトム・フィールディング ゴルフ
Distance Report Closer Look: "The performance of golf balls has changed significantly over the last 25 years, with many of those changes contributing directly to hitting distance increases." — Geoff Shackelford