Ribeiro et al. 2019: A. S. P. Ribeiro/C. Rinne/A. C. Valera, Geomagnetic investigations at Monte da Contenda, Arronches, Portugal – Results from the 2018 campaign. JNA 21, 2019, 61–73. DOI: https://doi.org/10.12766/jna.2019.3.