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Stauffer, B.; Wahlen, M.; Moraes, F. (1993). Atmospheric methane concentrations. In: Khalil, M. A. K. (ed.) Atmospheric methane: sources, sinks, and role in global change. NATO ASI Series: Vol. 13 (pp. 89-101). Springer 10.1007/978-3-642-84605-2_5
