Title	Authors	Year
Natural and anthropogenic variations in methane sources during the last 2 millennia. Science 490, 2012	Sapart, C.J., M. Prokopiou, G. Monteil, C. van der Veen, S. Houweling, R.S.W. van de Wal, M.C. Krol, P. Sperlich, T. Blunier, D. Dahl-Jensen, T. Sowers, J. Chappellaz, P. Martinerie, K.M. Krummhardt, J.O. Kaplan u. T. Röckmann	2012

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