Ermakova А. А., and Prokofyeva Л. П. “Synesthetic Associations in German and Russian Lullabies”. Proceedings of Southern Federal University. Philology, vol. 2020, no. 2, July 2020, pp. 131-4, https://philol-journal.sfedu.ru/index.php/sfuphilol/article/view/1478.