For citations:

Astashov E.A., Degtiareva S.D. Singularities of three-dimensional linear Nijenhuis operators with functionally independent invariants. Chebyshevskii Sbornik. 2025;26(5):73-83. (In Russ.) https://doi.org/10.22405/2226-8383-2025-26-5-73-83