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@article{13864, author = "Leitinger, R. and Putz, E. and Inst. Metrolog. Geoph. - Univ. Graz and 19. IUGG - Vancouver, Aug. 9-22, 1987", title = "Ionospheric Refraction Errors and observables ", year = "1987", note = "Obr. a tab. v textu. - Liter., 1 sv.", }