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\reference{gard18} Gardonio, B., R. Jolivet, E. Calais, H. Leclere (2018), The April 2017 M$_w6.5$ Botswana Earthquake: An Intraplate Event Triggered by Deep Fluids, {\itshape Geophysical Research Letters}, {\itshape 45}, no. 17, p. 8886--8896,  \href{https://doi.org/10.1029/2018GL078297}{\textcolor{brown}{\space\bfseries Cross\-ref}}
\reference{hath06} Hathaway, D., R. Wilson (2006), Geomagnetic activity indicates large amplitude for sunspot cycle 24, {\itshape Geophysical Research Letters}, {\itshape 33}, no. 18,  \href{https://doi.org/10.1029/2006GL027053}{\textcolor{brown}{\space\bfseries Cross\-ref}}
\reference{klot14} Klotz, O. (1914), Earthquakes, phases of the moon, sub-lunar and sub-solar points, {\itshape Journal of the Royal Astronomical Society of Canada}, {\itshape 8}, p. 273--281 (\href{http://articles.adsabs.harvard.edu//full/1914JRASC...8..273K/0000273.000.html} {http:// articles.adsabs.harvard.edu//full/1914JRASC...8..273 K/0000273.000.html}).
\reference{kova19} Kovalyov, M. (2019), Seismic activity and syzygies data, Earth Science DataBase, GC RAS, Moscow,  \href{https://doi.org/10.2205/RJES-data-650}{\textcolor{brown}{\space\bfseries Cross\-ref}}
\reference{vaqu05} Vaquero, J., R. Trigo (2005), Auroras Observed in Portugal in Late 18th Century, Obtained from Printed and Manuscript Meteorological Observations, {\itshape Solar Physics}, {\itshape 231}, p. 157--166 (The numerous low-latitude auroras in 1781--1789 are indicative of powerful geomagnetic storms. \href{http://idlcc.fc.ul.pt/pdf/Vaquero_Trigo_2005_Solar_Physics.pdf}{http://idlcc.fc.ul.pt/pdf/Va quero_Trigo_2005_Solar_Physics.pdf}).
