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- [3] EXISTENCE THEOREMS FOR CERTAIN 2-POINT BOUNDARY-VALUE PROBLEMS ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND PHYSIK, 1976, 27 (01): : 109 - 114
- [8] SINGULAR PERTURBATIONS OF NONLINEAR 2-POINT BOUNDARY-VALUE PROBLEMS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1973, 20 (07): : A659 - A659