S. C. Tefteller, Oscillation of Second Order Nonhomogeneous Linear Differential Equations, SIAM Journal on Applied Mathematics, Vol. 31, No. 3 (Nov., 1976), pp. 461-467 ...

Chelo Ferreira, José L. López, Ester Pérez Sinusía, Second order differential equations with an irregular singularity at the origin and a large parameter: convergent and asymptotic expansions, ...

The method of characteristics for solving first order quasilinear equations will be discussed. The three main types of linear second order partial differential equations will be considered: parabolic ...