de Wit, R.J., R.E. Hibbins, and P.J. Espy (2014), The seasonal cycle of gravity wave momentum flux and forcing in the high latitude northern hemisphere mesopause region, J. Atmos. Solar Terr. Phys., doi.org/10.1016/j.jastp.2014.10.002 (pdf)
de Wit, R.J., R.E. Hibbins, and P.J. Espy (2014), The seasonal cycle of gravity wave momentum flux and forcing in the high latitude northern hemisphere mesopause region, J. Atmos. Solar Terr. Phys., doi.org/10.1016/j.jastp.2014.10.002 (pdf)