Almost periodic solutions of second-order neutral delay–differential equations with piecewise constant arguments

Cooke, 1991, A survey of differential equations with piecewise continuous arguments, vol. 1475, 1 Fink, 1974, Almost Periodic Differential Equations, vol. 377 Li, 1999, The existence of almost periodic solutions of second-order neutral differential equations with piecewise constant argument, Northeast. Math. J, 15, 369 Piao, 2002, Almost periodic solutions of neutral equations with piecewise constant arguments, Acta Math. Sinica (English Ser.), 18, 263, 10.1007/s101140100151 Seifert, 2003, Second-order neutral delay–differential equations with piecewise constant time dependence, J. Math. Anal. Appl, 281, 1, 10.1016/S0022-247X(02)00303-7 Yuan, 1997, The existence of almost periodic solutions to second-order neutral differential equations with piecewise constant argument, Sci. Sinica A, 27, 873 Yuan, 2000, A new almost periodic type of solutions of second-order neutral delay differential equations with piecewise constant argument, Sci. China, 43, 371, 10.1007/BF02897160 Yuan, 2000, Pseudo-almost periodic solutions of second-order neutral delay differential equations with piecewise constant argument, Nonlinear Anal, 41, 871, 10.1016/S0362-546X(98)00316-2