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3. Meyer, G.H., Initial Value Methods for Boundary Value Problems, (Theory and Applications of Invariant Imbedding), Academic Press Inc., New York, 1972.
4. Scott, M.R., Invariant Imbedding and Its Applications to Ordinary Differential Equations, Addison-Wesley Publishing Co., Inc., 1973.
5. Kalaba, R. and J. Casti, Imbedding Methods in Applied Mathematics, Addison-Wesley Publishing Co,m Inc., 1973.