[R-pkg-devel] References in package description file

Hello world,
is there a standard way of adding references (scientific papers ...) to 
the description file in R packages other than putting the DOI in the 
description text? Does a best practise exist on how much references are 
advisable in order not to clutter the package information? Or should I 
put these things in the vignette instead?

Thanks and best regards,
 ??? Wolfgang