Volvach, A.E. and Kurbasova, G.S. 2019. Secular variations of geomagnetic declination in the Karadag point and the global helio-geodynamic processes. Geofizicheskiy Zhurnal. 41, 1 (Mar. 2019), 192–199. DOI:https://doi.org/10.24028/gzh.0203-3100.v41i1.2019.158873.