- Tsvetana Stoyanova, “Stokes Matrices of a Reducible Double Confluent Heun Equation via Monodromy Matrices of a Reducible General Huen Equation with Symmetric Finite Singularities”, J Dyn Control Syst, 28, № 1, 2022, 207
- Michał Zakrzewski, Henryk Żołądek, “Linear differential equations and multiple zeta-values. III. Zeta(3)”, Journal of Mathematical Physics, 53, № 1, 2012, 013507