Fursyak, Yurii. “Transverse Component of the Longitudinal Magnetic Field Gradient in Active Regions With Different Levels of Flare Productivity: Different Approaches to Calculation, Dynamics and Probable Critical Values”. Acta Astrophysica Taurica, vol. 5, no. 1, Mar. 2024, pp. 11-20, https://doi.org/10.34898/aat.vol5.iss1.pp11-20.