Demissie, T.D., P. J. Espy, N. H. Kleinknecht, M. Hatlen, N. Kaifler, and G. Baumgarten (2014), Characteristics and sources of gravity waves observed in NLC over Norway, Atmos. Chem. Phys., 14, 12133–12142, doi.org/10.5194/acp-14-12133-2014 (pdf)
Demissie, T.D., P. J. Espy, N. H. Kleinknecht, M. Hatlen, N. Kaifler, and G. Baumgarten (2014), Characteristics and sources of gravity waves observed in NLC over Norway, Atmos. Chem. Phys., 14, 12133–12142, doi.org/10.5194/acp-14-12133-2014 (pdf)