K2-111: an old system with two planets in near-resonance. - Mortier, A; Zapatero Osorio, M R; Malavolta, L; Alibert, Y; Rice, K; Lillo-Box, J; Vanderburg, A; Oshagh, M; Buchhave, L; Adibekyan, V; Delgado Mena, E; Lopez-Morales, M; et al. (Monthly Notices of the Royal Astronomical Society, 2020)