For citations:

Tropin A.M. On the bifurcation of the solution of the Fermat–Steiner problem under 1-parameter variation of the boundary in 𝐻(R2). Chebyshevskii Sbornik. 2021;22(4):265-288. (In Russ.) https://doi.org/10.22405/2226-8383-2021-22-4-265-288