วิธีเลขสี่มุม (Thai Wikipedia)

Analysis of information sources in references of the Wikipedia article "วิธีเลขสี่มุม" in Thai language version.

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yywzw.com

潘德孚 Pān Défú; 詹振权 Zhān Zhènquán (2003-05-20). 汉字编码设计学 [Chinese character coding design]. 语言文字网. chapter 2.1, section 1 & 2. pp. 19–20.