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The first paper - "Early-type Host Galaxies of Type Ia Supernovae. II. Evidence for Luminosity Evolution in Supernova Cosmology" is available at
https://arxiv.org/abs/1912.04903
The second paper - "Axion Emission Can Explain a New Hard X-Ray Excess from Nearby Isolated Neutron Stars" is available from
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.126.021102