polish the crossref function.
authorJohn Kitchin <jkitchin@andrew.cmu.edu>
Sat, 31 Jan 2015 17:44:28 +0000 (12:44 -0500)
committerJohn Kitchin <jkitchin@andrew.cmu.edu>
Sat, 31 Jan 2015 17:44:28 +0000 (12:44 -0500)
commitd40ccca9dd2b3003258ad6d5d63b35b946e3f54a
treeb07b949383378576749225f46cd80e7d787cb61b
parent2091cfcc6edd5da6a50f363dd0b6e9256c2bf8ab
polish the crossref function.

use citation string for crossref query
doi-utils.org