Glycosylation focuses sequence variation in the influenza A virus H1 hemagglutinin globular domain
PLoS Pathogens (2010) - Comments
pubmed: 21124818  doi: 10.1371/journal.ppat.1001211  issn: 1553-7374 

Suman R. Das, Pere Puigbò, Scott E. Hensley, Darrell E. Hurt, Jack R. Bennink, Jonathan W. Yewdell