Dereppe, J.-M., & Moreaux, C. (1985). Measurement of Chn Group Abundances in Fossil-fuel Materials Using Dept C-13 Nmr. Fuel : the science and technology of fuel and energy, 64(8), 1174-1176. https://doi.org/10.1016/0016-2361(85)90127-9 (Original work published 1985)