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Why I should put a ~ before \ref command?

I see the two used fairly interchangeably but have never read what the difference is between them...

marked as duplicate by Werner, Thorsten, Paulo Cereda, Stefan Kottwitz Feb 28 '12 at 16:48

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    ~ is a tie ie non-breaking space. Say word~\cite{...} ensure that we cannot have a line break between word and \cite{}. It is also very hand for regular references, I usually use ~ in front of all my references. – daleif Feb 28 '12 at 16:45
  • Possible duplicate: Why I should put a ~ before \ref command? – Werner Feb 28 '12 at 16:46

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