Solutions with exponential singularity for (3 + 1)-D Protter problems

On the existence and uniqueness of a generalized solution of the Protter problem for ( 3 + 1 ) $(3+1)$ -D Keldysh-type equations

(2017) Nedyu Popivanov et al.   Boundary Value Problems

Singular Solutions to a (3 + 1)-D Protter-Morawetz Problem for Keldysh-Type Equations

(2017) Nedyu Popivanov et al.   Advances in Mathematical Physics

Semi-Fredholm Solvability in the Framework of Singular Solutions for the (3+1)-D Protter-Morawetz Problem

(2014) Nedyu Popivanov et al.   Abstract and Applied Analysis

On the degenerate hyperbolic Goursat problem for linear and nonlinear equations of Tricomi type

(2014) Daniela Lupo et al.   NONLINEAR ANALYSIS-THEORY METHODS & APPLICATIONS

A MIXED EQUATION OF TRICOMI–KELDYSH TYPE

(2012) SHUXING CHEN   Journal of Hyperbolic Differential Equations

Protter-Morawetz multidimensional problems

(2012) Nedyu Popivanov et al.   Proceedings of the Steklov Institute of Mathematics