H. H. Zhun and O. Ye. Borshch, Improving the thermal insulation of nitrogen cryocontainers using the loop-shaped evacuation process, Low Temp. Phys. 47, (2021) [Fiz. Nizk. Temp. 47, 963-972, (2021)] DOI: https://doi.org/10.1063/10.0006071.