TY JOUR TI Weighted gravitational time series smoothing KW Discrete mathematical analysis KW time series KW gravitational smoothness residual KW smoothing JO Russian Journal of Earth Sciences AU Agayan, S.M. AU Bogoutdinov, S.R. AU Dobrovolsky, M.N. AU Kagan, A.I. PY 2014 IS 14 PB Geophysical Center of the Russian Academy of Sciences