Ray, W. O., & Walker, A. M. Perturbations of normally solvable nonlinear operators, I. Wiley.
Chicago Style (17th ed.) CitationRay, William O., and Anita M. Walker. Perturbations of Normally Solvable Nonlinear Operators, I. Wiley.
MLA (9th ed.) CitationRay, William O., and Anita M. Walker. Perturbations of Normally Solvable Nonlinear Operators, I. Wiley.
Warning: These citations may not always be 100% accurate.