You can search Japanese literature on selective mutism on CiNii.
http://ci.nii.ac.jp/en/
http://ci.nii.ac.jp/
CiNii is provided by National Institute of Informatics. CiNii's database includes Japanese literature which aren't listed on PubMed.
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[Related links]
Chinese literature on selective mutism
http://selectivemutism-mm.blogspot.com/2007/05/
chinese-literature-on-selective-mutism.html
Korean literature on selective mutism
http://selectivemutism-mm.blogspot.com/2007/04/
korean-literature-on-selective-mutism.html
Index of SM in Japan
