| Reference Point System - An optical system developed in Norway which makes judging offside easier. Diagrams, reports, testing, and contact details.
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| J.A.S.O.A. Soccer Referee site - The overseas branch of the US Soccer federation referees in Yokosuka Japan.
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| The Last Word - This site for referees offers plenty of information and links, but the newly updated forum seems to be the most popular feature.
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| Refex - International referee exchange for tournaments organized by Michael Wachowiak (Denmark).
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