P. V. Zinoviev and V. N. Zoryansky, Photoluminescence of C₆₀ fullerite intercalated with nitrogen molecules wide range of temperatures, Low Temp. Phys. 48, (2022) [Fiz. Nyzk. Temp. 48, 297-300, (2022)] DOI: https://doi.org/10.1063/10.0009547.