Warrington, E.M., Stocker, A.J., Zaalov, N.Y., Siddle, D.R. and Nasyrov, I.A. 2004. Propagation of HF radio waves over northerly paths: measurements,simulation and systems aspects. Annals of Geophysics. 47, 2-3 Sup. (Dec. 2004). DOI:https://doi.org/10.4401/ag-3292.