Angella, Daniele, and Hisashi Kasuya. “Cohomologies of Deformations of Solvmanifolds and Closedness of Some Properties”. North-Western European Journal of Mathematics, no. 3 (October 15, 2023): 73–104. Accessed November 21, 2024. https://nwejm.univ-lille.fr/index.php/nwejm/article/view/54.