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Phikul Oudkam. 2001. On metric-preserving functions. Field of Study Mathematics, Chulalongkorn University;
Phikul Oudkam. (2001) On metric-preserving functions . Chulalongkorn University/Bangkok.
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Phikul Oudkam. (2001) On metric-preserving functions . Chulalongkorn University/Bangkok.