@article{MZM_2021_110_5_a0,
     author = {V. M. Buchstaber and S. I. Tertychnyi},
     title = {Categories of {Symmetry} {Groups} of the {Space} of {Solutions} of the {Special} {Doubly} {Confluent} {Heun} {Equation}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {643--657},
     publisher = {mathdoc},
     volume = {110},
     number = {5},
     year = {2021},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2021_110_5_a0/}
}