模板:Cite MathWorld
Weisstein, Eric W. (编), Wolfram MathWorld (首頁), (關於MathWorld), at MathWorld--A Wolfram Web Resource,Wolfram Research, Inc. (英语)
Weisstein, Eric W. (编), Wolfram MathWorld (首頁), (關於MathWorld), at MathWorld--A Wolfram Web Resource,Wolfram Research, Inc. (英语)