A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2018; you can also visit the original URL.
The file type is
ON PERIODIC SOLUTIONS TO AUTONOMOUS RETARDED FUNCTIONAL DIFFERENTIAL EQUATIONS ZHANYUAN HOU Under the assumption that C o = C([-r, 0], S"" 1^) ) is positively invariant for a > 0, two necessary and sufficient conditions are obtained for an autonomous retarded functional differential equation to have a non-trivial periodic solution in C*. Moreover, a feasible sufficient condition is given, which is better for n = 2 than that given by Dos Reis and Baroni.doi:10.1017/s0004972700018219 fatcat:zokoy5iffra5jozwbdxa2nq2he