Ghosh, A., P. K. Patra, K. Ishijima, T. Umezawa, A. Ito, D. M. Etheridge, S. Sugawara, K. Kawamura, J. Miller, E. J. Dlugokencky et al. "
Variations in global methane sources and sinks during 1910–2010."
Atmos. Chem. Phys. 15, no. 5 (2015): 2595-2612.