Q. Wu, D. A. Ortland, S. C. Solomon, W. R. Skinner and R. J. Niciejewski, (2011) Global Distribution, Seasonal, and Inter-annual Variations of Mesospheric Semidiurnal Tide Observed by TIMED TIDI, Journnl of Atmospheric and Solar–Terrestrial Physics, doi:10.1016/j.jastp.2011.08.007