Nonlinear Optimal Stochastic Control - Some Approximations when the Noise is Small. - J. D. Perkins; R. W. H. Sargent (Optimization Techniques, 1975)

A New Sparsity Preserving Quasi-Newton Update for Solving Nonlinear Equations. - I. D. L. Bogle; J. D. Perkins (SIAM J. Sci. Comput., 1990)

On the design of robust two degree of freedom controllers. - David J. N. Limebeer; Ebrahim M. Kasenally; J. D. Perkins (Autom., 1993)