Title	Authors	Year
Ice core record of the 13C/12C ration of atmospheric CO2 in the past two centuries. Nature 324, 237-238.	Friedli, H., H.P. Lütscher, H. Oeschger, Ueli Siegenthaler u. B. Stauffer	1986

503 Service Unavailable

The website you're trying to access appears to be abnormally slow, please come back later.