D. Pancheva, N. J. Mitchell, A. H. Manson, C. E. Meek, C. Jacobi, Y. Portnyagin, E. Merzlyakov, W. K. Hocking, J. Macdougall, W. Singer, K. Igarashi, R. R. Clark, D. M. Riggin, S. J. Franke, D. Kurschner, A. N. Fahrutdinova, A. M. Stepanov, B. L. Kashcheyev, A. N. Oleynikov, and H. G. Muller. Variability of the quasi-2-day wave observed in the MLT region during the PSMOS campaign of June-August 1999. J. Atmos. Solar-Terr. Phys., volume 66, issue 6, pages 539-565, 2004 .