T. I. Akimova, O. A. Soldatkina, V. G. Savchenko, A. V. Pilipenko, A. A. Kapustina, “Stereoisomerism in the representative tetracyclic dispiro ozonide derived from (methylene)dicyclohexanone with the 1,5-diketo arrangement”, Mendeleev Commun., 32:2 (2022), 271–273