How can a page tell browsers that the HTML version of AMP exists?

I understand that I will have two pages, one from AMP and the usual. AMP has a canonical reference to regular, but how does regular indicate that there is a version of AMP?

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The AMP document discovery documentation indicates that you need to add this tag to <head> :

 <link rel="amphtml" href="..."> 

As an example, if you look at the page of a publisher that already supports AMP, for example http://www.bbc.co.uk/news/world-europe-34471849 , you can see this tag in <head> :

 <link rel="amphtml" href="http://www.bbc.co.uk/news/amp/34471849"> 
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