It is important to have backlinks from quality sites, and those backlinks should be contextual. If, for example, you have a site about fish, and you are creating links from other niche sites about monkeys, these links will be of no use. Your goal should be to get links from authoritative and relevant sites.

https://www.ueda.info.waseda.ac.jp/~wakako/wiki/index.php?externdatabase
http://www.sse.tottori-u.ac.jp/hp-keiei/index.php?externdatabase
http://www.nejinews.co.jp/wiki/?externdatabase
http://www.maxi.jaxa.jp/7gf32g8fv238f76g/matsuoka_repository/index.php?externdatabase
http://www.jaist.ac.jp/~t-konno/pw-e/index.php?externdatabase
http://wiki.crap.jp/ankoku_midori/index.php?externdatabase



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