[[1] Păun, A.,Brezeanu, P., Theoretical aspects regarding public expenditures, Annals of the University of Petroşani. Economics, Petroșani, Vol. 13, 2013.]Search in Google Scholar
[[2] European Commision, Spring 2018 Economic Forecast – Romania, 3 May 2018.]Search in Google Scholar
[[3] https://ncss-wpengine.netdna-ssl.com/wp-content/themes/ncss/pdf/Procedures/NCSS/Cross-Correlations.pdf]Search in Google Scholar
[[4] Morten O. Ravn&HaraldUhlig, “On adjusting the Hodrick-Prescott filter for the frequency of observations,” The Review of Economics and Statistics, MIT Press, vol. 84(2), pages 371-375, 200210.1162/003465302317411604]Search in Google Scholar
[[5] Hodrick, Robert; Prescott, Edward C., “Postwar U.S. Business Cycles: An Empirical Investigation, 1997.10.4324/9780203070710.pt8]Search in Google Scholar
[[6] C. W. J. Granger, Investigating Causal Relations by Econometric Models and Cross-spectral Methods, Econometrica, Vol. 37, No. 3, pp. 424-438, Aug., 1969.10.2307/1912791]Search in Google Scholar