Geodesic
Singular perturbations in problems of optimal control
Itogi nauki i tehniki. Seriâ, Matematičeskij analiz, Itogi Nauki i Tekhniki. Seriya "Matematicheskii Analiz", Volume 20 (1982), pp. 3-77 
A. B. Vasil'eva; M. G. Dmitriev. Singular perturbations in problems of optimal control. Itogi nauki i tehniki. Seriâ, Matematičeskij analiz, Itogi Nauki i Tekhniki. Seriya "Matematicheskii Analiz", Volume 20 (1982), pp. 3-77. http://geodesic.mathdoc.fr/item/INTM_1982_20_a0/
@article{INTM_1982_20_a0,
     author = {A. B. Vasil'eva and M. G. Dmitriev},
     title = {Singular perturbations in problems of optimal control},
     journal = {Itogi nauki i tehniki. Seri\^a, Matemati\v{c}eskij analiz},
     pages = {3--77},
     year = {1982},
     volume = {20},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTM_1982_20_a0/}
}
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See the original book chapter notice from the Math-Net.Ru source

One presents a survey of the works on the theory of optimal control by deterministic objects, described by systems of ordinary differential or difference equations, where the investigation is carried out with the aid of the methods of the theory of singular perturbations. One analyzes the possibility of the application of the theory of singular perturbations to the investigation of control problems with large amplification coefficient in the feedback circuit, to the description of sliding regimes in systems with variable structure, and to the construction of effective numerical algorithms for the solution of optimization problems.