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→Referencing formulae
Equations can be referred to by simply adding a label to {{cmd|placeformula}} and using {{cmd|ref}} to create the reference:
<contextsource="yes" text="This, when typeset, produces the following:">\setuppapersize[A5]\setuplayout[width=8cm]The famous result (and againonce more) is given by\placeformulastartplaceformula[formulalabelmyformularef]\startformulac^2 = a^2 + b^2.\stopformula\stopformulastopplaceformula
And now we can refer to formula \ref[][formulalabel].
</context>
Note, that {{cmd|ref}} expects two arguments, therefore you need the brackets twice.