Comparison and Oscillation Theorems for singular Ultrahyperbolic Equations
A Theorem on the Geometric Mean of an Entire Function
Helmholtz Equation and WKB Approximation in the Tidal wawe Propagation
On │Ñ Pn ׀k | Summability Factors of Infinite Series
On Absolute a-summability factors
The Interior and Exterior Problems For The Generalized Poly-Axially Symmetric Helmholtz Equation