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About asymptotic approximation of solutions of ODE:

(with U. Elias)
Oscillation of twoterm differential equations through asymptotics,
J. Math. Anal. Appl., 186(1994), 283305. (ps, 185K)

(with U. Elias)
Oscillation and block diagonalization,
J. Math. Anal. Appl., 199(1996), 202212. (ps, 88K)

(with U. Elias)
Asymptotic approximation for matrix differential equations and applications,
Differential and Integral Equations, 10(1997), 137152. (ps, 146K)

(with U. Elias)
More on asymptotic approximation and application for matrix differential
equations
J. Math. Anal. Appl., 230(1999), 97111. (pdf, 110K)