About @Eq and double integral

Dominique Crétel <[email protected]>
Newsgroups gmane.comp.type-setting.lout
Message-ID <[email protected]> 
Hi all,

How to get a beautiful double integral symbol ?

Here is what I've done :
@Eq { big int big int sub Sigma f(x) dx }
but the result is not so pretty !

I'd like something like here : http://personal.maths.surrey.ac.uk/st/S.Gourley/double_int.pdf

Thanks

Dominique Cretel
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