Boundary value problems for delay differential systems. Boichuk, A.; Diblík, J.; Khusainov, D.; Růžičková, M. — 2010 Advances in Difference Equations [electronic only]
Perturbed Fredholm boundary value problems for delay differential systems. Boichuk, Alexander A.; Grammatikopoulos, Myron K. — 2003 Abstract and Applied Analysis