Contents of Volume 1, Number 3 July 1993

Impulsive Differential Equations of First order with Periodic Boundary Conditions
C.PIERSON-GOREZ
Pages 185 - 196

Oscillation and Nonoscillation for a Class of Neutral Differential Equations
X.Z.LIU, J.S.YU AND B.G.ZHANG
Pages 197 - 204

Multiple Periodic Solutions of the Spherical Wave Equation
A.K.BEN-NAOUM
Pages 205 - 210

A Generalization of the Monodromy Operator for Non-periodic Linear Differential Equations
B.AULBACH, NGUYEN VAN MINH AND P.P.ZABREIKO
Pages 211 - 222

Sturmian Theory on Measure Chains
LYNN ERBE AND STEFAN HILGER
Pages 223 - 244

Oscillatory Conditions for a Stieltjes Type Neutral Integro-Differential Equation
I.GY¨ORI, B.S.LALLI AND E.THANDAPANI
Pages 245 - 256

Stability Analysis with Respect to Two Measures of Systems Under Structural Perturbations
A.A.MARTYNYUK
Pages 257