E. A. Kudryavtseva.
Uniform Morse lemma and isotopy criterion for Morse functions on surfaces
T. P. Lukashenko, S. M. Lytkin.
Expansion over a system of shifts of pyramidal functions
Yu. V. Nesterenko.
An elementary proof of the irrationality of
V. R. Tagirova.
A solution to the hydraulic fracture problem in the traveling wave form