Algorithm for rigorous integration of Delay Differential Equations and   the computer-assisted proof of periodic orbits in the Mackey-Glass equation
  We present an algorithm for the rigorous integration of Delay Differential Equations (DDEs) of the form $x'(t)=f(x(t-\tau),x(t))$. As an application, we give a computer assisted proof of the existence of two attracting periodic orbits (before and after the first period-doubling bifurcation) in the Mackey-Glass equation. 
Robert Szczelina and Piotr Zgliczy\'nski
math.DS