Hervig, Mark; Thompson, Robert E.; McHugh, Martin; Gordley, Larry L.; Russel, James M.; Summers, Michael E. (March 2001), “First Confirmation that Water Ice is the Primary Component of Polar Mesospheric Clouds”, Geophysical Research Letters28 (6): 971–974, Bibcode: 2001GeoRL..28..971H, doi:10.1029/2000GL012104
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Hervig, Mark; Thompson, Robert E.; McHugh, Martin; Gordley, Larry L.; Russel, James M.; Summers, Michael E. (March 2001), “First Confirmation that Water Ice is the Primary Component of Polar Mesospheric Clouds”, Geophysical Research Letters28 (6): 971–974, Bibcode: 2001GeoRL..28..971H, doi:10.1029/2000GL012104