Interannual variations in the (¹⁷O) signature of atmospheric CO₂ at two mid-latitude sites suggest a close link to stratosphere–troposphere exchange, Steur, P. M., Scheeren H. A., Koren G., Adnew G. A., Peters W., and Meijer H. A. J. , Atmospheric Chemistry and Physics, 2024///, Volume 24, Issue 19, p.11005 - 11027, (2024)