An algorithm to detect non-background signals in greenhouse gas time series from European tall tower and mountain stations oleh A. Resovsky, M. Ramonet, L. Rivier, J. Tarniewicz, P. Ciais, M. Steinbacher, I. Mammarella, M. Mölder, M. Heliasz, D. Kubistin, M. Lindauer, J. Müller-Williams, S. Conil, R. Engelen