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- http://www.gauss.hk/en/about.asp?id=5 (06 Mar 2019)
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852-35688790
http://www.gauss.hk/en/about.asp?id=5 (06 Mar 2019)
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852-24086161
http://www.gauss.hk/en/about.asp?id=5 (06 Mar 2019)