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ALMA observations of the variable ¹²CO/¹³CO ratio around the asymptotic giant branch star R Sculptoris⋆⋆⋆

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The C/O ratio at low metallicity: constraints on early chemical evolution from observations of Galactic halo stars

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CO bands in V4334 Sgr (Sakurai's Object): The $\mathsf{^{12}}$C/$\mathsf{^{13}}$C ratio

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The relation of H₂CO, ¹²CO, and ¹³CO in molecular clouds⋆

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