C. Mccord et K. Mischaikow, ON THE GLOBAL DYNAMICS OF ATTRACTORS FOR SCALAR DELAY EQUATIONS, Journal of the American Mathematical Society, 9(4), 1996, pp. 1095-1133
A semi-conjugacy from the dynamics of the global attractors for a fami
ly of scalar delay differential equations with negative feedback onto
the dynamics of a simple system of ordinary differential equations is
constructed. The construction and proof are done in an abstract settin
g, and hence, are valid for a variety of dynamical systems which need
not arise from delay equations. The proofs are based on the Conley ind
ex theory.