@article{IIGUM_2024_47_a8,
     author = {Sergey V. Sudoplatov},
     title = {Variations of rigidity},
     journal = {The Bulletin of Irkutsk State University. Series Mathematics},
     pages = {119--136},
     publisher = {mathdoc},
     volume = {47},
     year = {2024},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IIGUM_2024_47_a8/}
}