De Santis A, Qamili E, Cianchini G. Repeat-station surveys: implications from chaos and ergodicity of the recent geomagnetic field. Ann. Geophys. [Internet]. 2013Apr.18 [cited 2024Apr.26];56(1):R0103. Available from: https://www.annalsofgeophysics.eu/index.php/annals/article/view/5491