Long term measurements from the Mátra Gravitational and Geophysical Laboratory.Published in:European Physical Journal: Special Topics, 2019, v. 228, n. 8, p. 1693, doi. 10.1140/epjst/e2019-900153-1By:Ván, P.;Barnaföldi, G. G.;Bulik, T.;Biró, T.;Czellár, S.;Cieślar, M.;Czanik, Cs.;Dávid, E.;Debreceni, E.;Denys, M.;Dobróka, M.;Fenyvesi, E.;Gondek-Rosińska, D.;Gráczer, Z.;Hamar, G.;Huba, G.;Kacskovics, B.;Kis, Á.;Kovács, I.;Kovács, R.Publication type:Article