VALACH, Fridrich, Magdaléna VÁCZYOVÁ, Dalibor VÝBERČI, and Eduard KOČI. 2024. “Regular Observations of the Geomagnetic Field at the Ógyalla Observatory (present-Day Hurbanovo) Near the Turn of the 20th Century, Including Magnetic Storms Accompanied by Auroras in March 1894, September 1898, and October 1903”. Contributions to Geophysics and Geodesy 54 (1):23-48. https://doi.org/10.31577/congeo.2024.54.1.2.