The Age of the Old Metal-poor Globular Cluster NGC 6397 Using WFC3/IR Photometry
Journal article published in 2018 by
Matteo Correnti 
,
Mario Gennaro ,
Jason S. Kalirai,
Roger E. Cohen,
Thomas M. Brown
,
Mario Gennaro ,
Jason S. Kalirai,
Roger E. Cohen,
Thomas M. Brown
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