Cattiaux, D., Golokolenov, I., Kumar, S., Sillanpää, M., Mercier de Lépinay, L., Gazizulin, R. R., Zhou, X., Armour, A. D., Bourgeois, O., Fefferman, A., Collin, E., "A macroscopic object passively cooled into its quantum ground state of motion beyond single-mode cooling", Nature Communications, 2021