Hanyu's quad loop adds to Japan's skating legacy - The Japan Times
FIGURE SKATING | Yuzuru Hanyu Claims Sixth Japan Title, Nearly Lands Historic Quadruple Axel | JAPAN Forward
What Is a Quad in Figure Skating? Kamila Valieva's Historic Jumps at Beijing Olympics – NBC New York
What's the difference between a toe loop, an axel, and a lutz? - Quora
Japan's Yuzuru Hanyu lands 1st-ever quad loop in competition | CBC Sports
Kamila Valieva makes Olympic history with quadruple jumps - The Washington Post
What is the '4A' – the most difficult move in figure skating? - Global Times
Malinin's quad axel lifts 17-year-old to Skate America title | AP News
Quadruple jump - Wikipedia
How Quad Jumps Have Changed Women's Figure Skating | FiveThirtyEight
How Olympic Figure Skaters Break Records with Physics | Scientific American
Yuzuru Hanyu's Quad Loop Collection - YouTube
Kamila Valieva completes successful quad jump at Winter Olympics in Beijing | 11alive.com
US figure skater Ilia Malinin lands 1st quad axel in competition
Hanyu Yuzuru becomes the first skater in history to execute quadruple Axel on international stage-Xinhua
US teen skater becomes 1st to land all six quads - Taipei Times
Quadruple Loop Nathan Chen - YouTube
Hanyu becomes first figure skater to achieve clean quad loop in official ISU competition
Hanyu lands four quadruple jumps and wins World Championships – Waseda University
How the Quad Jump Is Changing Women's Figure Skating - The New York Times
Quadruple Toe Loop Yuzuru Hanyu - YouTube
Nathan Chen Made History With 6 Quad Jumps. What's That? | TIME
Figure skating star lands quadruple Rittberger jump in training, coach says
Women's Skating Quad Jumps History: Surya Bonaly Tried to Do It 30 Years Ago | TIME
How Quad Jumps Have Changed Women's Figure Skating | FiveThirtyEight
A quadruple Axel in competition? “Not anytime soon” for world champion Nathan Chen - Olympic News
Quadruple jumps in women's figure skating: What to expect at Olympics
Jumping wizards make possibilities seem endless — Globetrotting by Philip Hersh
