“ULTRA-LOW-FREQUENCY FLUCTUATIONS OF GEOMAGNETIC FIELD AS MEAS- URED AT THE OBSERVATORY ALMA-ATA [43.25N; 76.95E]”, ЖПЭОС, vol. 21, no. 1-2, pp. 91–98, Jan. 2023, Accessed: Jul. 06, 2026. [Online]. Available: https://peos.kaznu.kz/index.php/peos/article/view/262