Sorgenfrei, C., et al., "Detection of colour variations from gravitational microlensing observations in the quadruple quasar HE0435-1223: Implications for the accretion disc",
2025, A&A 703, A250

Sorgenfrei, C., et al., "Improving the light curves of gravitationally lensed quasars with Gaia proper motion data ",
2024, A&A 683, A119


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