  In this paper, we derive sharp asymptotics for the spectral data (eigenvalues
and weight numbers) of the fourth-order linear differential equation with a
distribution coefficient and three types of separated boundary conditions. Our
methods rely on the recent results concerning regularization and asymptotic
analysis for higher-order differential operators with distribution
coefficients. The results of this paper have applications to the theory of
inverse spectral problems as well as a separate significance.
