Partial Differential Equations : New Methods for Their Treatment and Solution

by Bellman, N.D., Adomian, G.
Published 1985

Wave Propagation : An Invariant Imbedding Approach

by Bellman, N.D., Vasudevan, J.
Published 1986

Methods in Approximation : Techniques for Mathematical Modelling

by Bellman, N.D., Roth, R.S.
Published 1986