Journal article (2013) - EJ Bucsela (author), NA Krotkov (author), EA Celarier (author), L. Lamsal (author), WH Swartz (author), PK Bhartia (author), K.F. Boersma Boersma (author), j. Pepijn Veefkind (author), JF Gleason (author), KE Pickering (author)