LUTEPHY, M. 2018. Interplanetary external driven quasidynamo as the origin of geomagnetic jerks correlated with length of day and gravity anomaly: The origin of 5.9-years and 11-years and semi-annual periodic geophysical signals and Jovian planets alignments as the origin of the abrupt geomagnetic jerks. Contributions to Geophysics and Geodesy. 48, 1 (Mar. 2018), 23–74. DOI:https://doi.org/10.2478/congeo-2018-0002.