The collocation method for the numerical approximation of the periodic solutions of functional differential equations. - Alfredo Bellen (Computing, 1979)

A collocation method for boundary value problems of differential equations with functional arguments. - Alfredo Bellen; Marino Zennaro (Computing, 1984)

Numerical solution of constant coefficient linear delay differential equations as abstract Cauchy problems. - Alfredo Bellen; Stefano Maset (Numerische Mathematik, 2000)