Liu, D., Daddi, E., Schinnerer, E., Saito, T., Leroy, A., Silverman, J. D., …Groves, B. (2021). CO Excitation, Molecular Gas Density, and Interstellar Radiation Field in Local and High-redshift Galaxies. Astrophysical Journal, 909(1), Article 56. https://doi.org/10.3847/1538-4357/abd801