Use dx.doi.org service to get a BibTeX-formatted reference from a DOI.

getbib.sh

#!/bin/bash
# | pbcopy; pbpaste are mac-only commands; delete to simply print to the shell.
# Use: getbib $DOI where $DOI is something like 10.xxx/xxxxxx
getbib(){
	curl -LH "Accept:text/bibliography; style=bibtex" http://dx.doi.org/$1 2>/dev/null | cut -c 2- | pbcopy ; pbpaste
}