Lineĭnye different︠s︡ialʹnye operatory

Linear partial differential operators

Lars Hörmander

Handbook of Linear Partial Differential Equations for Engineers and Scientists

Andrei D. Polyanin

A course in ordinary differential equations

Randall J. Swift

A course in differential equations with boundary value problems

Stephen A. Wirkus

Method of Averaging for Differential Equations on an Infinite Interval

Vladimir Burd

Linear differential equations and group theory from Riemann to Poincaré

Jeremy J. Gray

Lectures on Cauchy's problem in linear partial differential equations

Jacques Hadamard

Lehrbuch der Theorie der Differentialgleichungen mit einer unabhängigen Variabeln

Leo Koenigsberger

Integration der linearen differentialgleichungen mit constanten und veränderlichen coefficienten

Joseph Petzval