HvD: Adding the DOI to the reference. The PNAS journal is hopeless for finding anything in. So having the DOI of the paper makes accessing it much simpler  through CrossRef.
HvD: Adding the DOI to the reference. The PNAS journal is hopeless for finding
anything in. So having the DOI of the paper makes accessing it much simpler 
through CrossRef.





rangsimanketkaew/NWChem