"Equacions diferencials Expansions asimptòtiques." . . "Perturbations singulières (mathématiques)" . . "Problèmes aux limites." . . "Equacions diferencials" . . "Pertorbació (Matemàtica)" . . "Boundary layer." . . "perturbation singulière." . . . . "heuristique." . . "Perturbazione (Matematica)" . . "Differentialgleichung." . . "Asymptotik." . . "MATHEMATICS Differential Equations General." . . "comportement asymptotique." . . "Perturbation (Mathématiques)" . . "Perturbaciones singulares (Matemáticas)" . . "couche limite." . . "Couche limite." . "Ecuaciones diferenciales Teoría asintótica." . . "équation différentielle." . . "Teoria dello strato limite." . . "Equations differentielles Theorie asymptotique." . . "Équations différentielles Théorie asymptotique." . "analyse asymptotique." . . "Differential equations Asymptotic theory." . . "Equacions diferencials Teoria asimptòtica." . . "Differentiaalvergelijkingen." . . "Strömungsmechanik." . . "Asymptotische Methode." . . . . "Electronic books"@en . "Electronic books" . . . . . "Asymptotic analysis of singular pertubations" . . . . . . . . . . . . . . . . . . . . . . . . . . . . . "Llibres electrònics" . . . . . . . . . . . . . . . . . . . . . "Asymptotic Analysis of Singular Perturbations"@en . . . . . . "Asymptotic Analysis of Singular Perturbations."@en . . "Asymptotic analysis of singular perturbations"@en . "Asymptotic analysis of singular perturbations" . . "Perturbation (Mathematics)" . . "Singularität (Mathematik)" . . "Equazioni differenziali - Teoria asintotica." . . "Differential equations Asymptotic theory. Perturbation (Mathematics) Boundary layer." . . "Störungstheorie." . . "ECKHAUS W." . . "Eckhaus, W." .