Schroder, K., Staemmler, V., Smith, M., Flower, D., & Jaquet, R. (1991). Excitation of the fine-structure transitions of C in collisions with ortho- and para-Hâ‚‚. Journal of Physics B: Atomic, Molecular and Optical Physics, 24, 2487-2502. https://doi.org/10.1088/0953-4075/24/10/007