VALACH F, VÁCZYOVÁ M, VÝBERČI D, KOČI E. 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. Contrib. Geophys. Geod. [Internet]. 2025 Aug. 15 [cited 2026 Feb. 4];54(1):23-48. Available from: https://journals.savba.sk/index.php/cgg/article/view/5449