Gašparová, Renáta, Katarína Kotlebová, and Margita Lácová. “Reactions of 4-Hydroxycoumarin With Heterocyclic Aldehydes”. Nova Biotechnologica et Chimica 9, no. 3 (September 2, 2021): 349–354. Accessed October 27, 2026. https://office.nbc-journal.org/index.php/NBC/article/view/1146.