Radii of Valence of Certain Analytic Functions with Negative Coefficients
On Absolute a-summability factors
Comparison and Oscillation Theorems for singular Ultrahyperbolic Equations
Helmholtz Equation and WKB Approximation in the Tidal wawe Propagation
A Theorem on the Geometric Mean of an Entire Function
The Interior and Exterior Problems For The Generalized Poly-Axially Symmetric Helmholtz Equation