ELECTRONIC	h   t   t   p   c o l o n   s l a s h   s l a s h   a d s a b s dot h a r v a r d dot e   d   u   s l a s h   a b s   s l a s h   t w o   o   o   n i n e   g e o r l	http://adsabs.harvard.edu/abs/2009georl	1