An operational approach to the Tau method for the numerical solution of non-linear differential equations. - Eduardo L. Ortiz; H. Samara (Computing, 1981)

Numerical solution of differential eigenvalue problems with an operational approach to the Tau method. - E. L. Ortiz; H. Samara (Computing, 1983)

Numerical solution of ordinary and partial functional-differential eigenvalue problems with the Tau Method. - Kam-Moon Liu; Eduardo L. Ortiz (Computing, 1989)

A recursive formulation of collocation in terms of canonical polynomials. - M. K. El-Daou; E. L. Ortiz (Computing, 1994)

The Tau Method as an Analytic Tool in the Discussion of Equivalence Results Across Numerical Methods. - M. K. El-Daou; E. L. Ortiz (Computing, 1998)