DOLINSKÝ, P., F. VALACH, and M. VÁCZYOVÁ. “Magnetic Ground Survey of Slovakia for the 2007.5 Epoch – Accuracy of Geomagnetic Elements Distribution Maps”. Contributions to Geophysics and Geodesy, Vol. 43, no. 1, Mar. 2013, pp. 73-80, doi:10.2478/congeo-2013-0005.