Solution of multi-delay systems via combined block-pulse functions and Legendre polynomials. Razzaghi, Mohsen (2009) Analele Ştiinţifice ale Universităţii “Ovidius" Constanţa. Seria: Matematică
Solvability and algorithms for functional equations originating from dynamic programming. Jiang, Guojing, Kang, Shin Min, Kwun, Young Chel (2011) Fixed Point Theory and Applications [electronic only]