Bistability between π -diradical open-shell and closed-shell states in indeno[1,2- a ]fluorene - Mishra, S; Vilas-Varela, M; Lieske, L; Ortiz, R; Fatayer, S; Rončević, I; Albrecht, F; Frederiksen, T; Peña, D; Gross, L (Nature Chemistry, 2024)