The authors consider the problem of constructing an asymptotic solution of a system of linear differential equations in which a real small parameter e > 0 is a multiplier of some of the derivatives.
Differential equations in which the small parameter is a multiplier of the lower order derivatives are reduced to such systems.
Citation Example:Feshchenko S. F., ShkiI N. I. An Asymptotic Solution of a System ot Linear Differential Equations Having a Small Diameter with Derivatives // Ukr. Mat. Zh. - 1960. - 12, № 4. - pp. 429 - 438.