1
by Bellman, N.D., Adomian, G.
Published 1985
Springer Netherlands
Table of Contents: ... and Partial Differential Equations -- IV / The Euler-Lagrange Equations and Characteristics -- V...

2
by Bellman, N.D., Roth, R.S.
Published 1986
Springer Netherlands
Table of Contents: ... Wave Equation -- Systems of Nonlinear Partial Differential Equations -- Higher Order Systems -- Long...