(1961). An estimate for the perturbations of the solutions of ordinary differential equations. Vestn. Mosk. Univ. Ser. I. Math. Mech., 2, 28-36.

(1992). Lipschitz stability and exponential asymptotic stability in perturbed systems. J. Korean Math. Soc., 29, 175-190.

(1993). h-stability in differential systems. Bull. Inst. Math. Acad. Sinica, 21, 245-262.

(1997). h-stability of differential systems via <TEX>$t_{\infty}$</TEX>-similarity. Bull. Korean. Math. Soc., 34, 371-383.

(1957). Sulla <TEX>$t_{\infty}$</TEX>-similitudine tra matricie l'equivalenza asintotica dei sistemi differenziali lineari. Rivista di Mat. Univ. Parma, 8, 43-47.

(2010). h-stability of the nonlinear differential systems via <TEX>$t_{\infty}$</TEX>-similarity. J. Chungcheong Math. Soc., 23, 383-389.

(2010). h-stability of the nonlinear perturbed differential systems. J. Chungcheong Math. Soc., 23, 827-834.

(2011). h-stability of the nonlinear perturbed differential systems via <TEX>$t_{\infty}$</TEX>-similarity. J. Chungcheong Math. Soc., 24, 695-702.

(2011). h-stability of perturbed differential systems. J. Korean Soc. Math. Edu. Ser. B: Pure Appl. Math., 18, 337-344.

(1973). Stability properties of the equation by <TEX>$t_{\infty}$</TEX>-similarity. J. Math. Anal. Appl., 41, 336-344. 10.1016/0022-247X(73)90209-6.

Differential and Integral Inequalities: Theory and Applications Vol. I.

(1973). A note on Gronwall-Bellman inequality. J. Math. Anal. Appl., 44, 758-762. 10.1016/0022-247X(73)90014-0.

(1984). Perturbations of asymptotically stable differential systems. Analysis, 4, 161-175.

(1988). Asymptotic integration of a system resulting from the perturbation of an h-system. J. Math. Anal. Appl., 131, 194-216. 10.1016/0022-247X(88)90200-4.

(1992). Stability of nonlinear differential systems. Applicable Analysis, 43, 1-20. 10.1080/00036819208840049.