4COOKE K L, WIENER J. Retarded differential equation with piecewise constant delays [ J]. Math Anal Appl, 1984,99:265 -297.
5SHAH S M, WIENER J. Advanced differential equations with piecewise constant argument deviations[J]. J Internet Math Soc, 1983 (6) :671 -703.
6YUAN R, HONG J. The existence af almost periodic solution for a class of differential cquations with piecowise constant argume[J]. Nonllear Analysis,TMA, 1997,28(8) :1439 - 1450.
7COOKE K L,WIENER J.A survey of differential equations with piecewise constant argument[A].Lecture Notes in Mathematics[C],Berlin:Spring-Verlag,1991,475.1-15.
8ZHANG C.Almost periodic type functions and ergodicity[M].[s.l.]:Kluwer Academic Publishers,2003.
9FINK A M.Almost Periodic Differential Equations[M].Berlin:Springer-verlag,1974.
10MEISTERS G H,On almost periodic solutions of a class of differential equations[J].Proc Amer Math Soc,1959,(10):113-119.