K. CSICSAY, M. BIELIK, A. MOJZEŠ, E. SPEVÁKOVÁ, B. KYTKOVÁ, and M. GRINČ, “Linearization of the Sobolev and Babeyko’s formulae for transformation of P-wave velocity to density in the Carpathian-Pannonian Basin region”, Contrib. Geophys. Geod., vol. 42, no. 1, pp. 15-23, Mar. 2012.