[1] Specifications | Matroska (2010-07-24 23:58:10 +09:00 版) <http://www.matroska.org/technical/specs/index.html>

[2] Matroska Media Container - Homepage | Matroska (2017-05-09 16:58:29 +09:00) <https://www.matroska.org/>

[3] Specifications | Matroska (2017-05-09 17:14:30 +09:00) <https://www.matroska.org/technical/specs/index.html>