BAINOV, D.D., KOSTADINOV, S.I., MINH, N.V. and ZABREIKO, P.P. 1994. A TOPOLOGICAL CLASSIFICATION OF DIFFERENTIAL EQUATIONS WITH IMPULSE EFFECT. Tamkang Journal of Mathematics. 25, 1 (Mar. 1994), 15–27. DOI:https://doi.org/10.5556/j.tkjm.25.1994.4420.