This paper is concerned with the asymptotic stability of delay differential-algebraic equations. Two stability criteria described by evaluating a corresponding harmonic analytical function on the boundary of a certain region are presented. Stability regions are also presented so as to show the method geometrically. Our results are not reported.
"Boundary Criteria for the Stability of Delay Differential-Algebraic Equations." Abstr. Appl. Anal. 2015 1 - 6, 2015. https://doi.org/10.1155/2015/768345