Transition disc nature of post-AGB binary systems confirmed by mid-infrared interferometry A. Corporaal, J. Kluska, H. Van Winckel, K. Andrych, N. Cuello, D. Kamath and A. Mérand A&A, 674 (2023) A151 Published online: 16 June 2023 DOI: 10.1051/0004-6361/202346408