Bousquet P, Ringeval B, Pison I, Dlugokencky E J, Brunke E-G, Carouge C, Chevallier F, Fortems-Cheiney A, Frankenberg C, Hauglustaine D A, Krummel P B, Langenfelds R L, Ramonet M, Schmidt M, Steele L P, Szopa S, Yver C, Viovy N, Ciais P, . (2011). Source attribution of the changes in atmospheric methane for 2006-2008. 1680-7316, 11(8), 3689–3700.