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<h2 id="see-also">See also</h2> <ul><li><a href="/facts/Java_Modeling_Language/q3RNMJU6">JML</a></li> <li><a href="/facts/Safety_Integrity_Level/qzHdBEDx">Safety Integrity Level</a></li></ul> <h2 id="external-links">External links</h2> <ul><li><a href="http://www.eschertech.com/products/">Perfect Developer</a></li> <li><a href="http://www.eschertech.com/">Escher Technologies</a></li> <li><a href="https://web.archive.org/web/20060106062624/http://www.dstan.mod.uk/">Defence Standards</a></li></ul>