On Calculating the Eigenvalues of the Finite Hill's Differential Equation
On Hill's equation with a discontinuous coefficient.
On limit properties of phases and of central dispersions in the oscillatory equation with a periodic coefficient
On non-existence of periodic solutions of an important differential equation
On the genericity of nonvanishing instability intervals in Hills equation
On the Reduction of Holt's Problem to a Finite Interval.
On the solution of some simple fractional differential equations.