N. Vasilyev and A. Lepin.
On some singular boundary
value problem (Russian).
On some boundary value problem of
the calculus of variations (Russian)
On the linear boundary conditions (Russian)
On a boundary value problem for an n-th order differential equations (Russian)
On some boundary value problems for an n-th order differential equations (Russian)
Boundary value problems possessing a maximal solution
under the conditions 1-D. (Russian)
About uniqueness of a solution of boundary value problems for a system of two first-order differential equations with linear boundary conditions, III. (Russian)
Multiplicity results for the Neumann boundary value problem
Fuchik spectrum for the second order Sturm-Liouville boundary value problem
On nonlinear eigenvalue problems
On Fu\v{c}ik spectra for the third and fourth order equations
On solutions of the fourth-order nonlinear boundary value problems