Boundedness of solutions for a class of reversible systems

In this paper, we are concerned with the boundedness of all solutions for the following differential systemx^'[email protected]"p(y)+e(t),y^'[email protected]"q(x)-f(x)@f"p(y)+f(x)e(t),where @f"r(s)=|s|^r^-^2s, r>1, f(x) is odd, e(t)@?C^4(R/Z) is even, max{1,p/[2(p-1)]}