N. Ginoux, G. Habib, M. Pilca, and U. Semmelmann, “An Obata-type characterisation of Calabi metrics on line bundles”, NWEJM, no. 6, pp. 119–138, Sep. 2020, Accessed: Oct. 18, 2024. [Online]. Available: https://nwejm.univ-lille.fr/index.php/nwejm/article/view/32