Young-Chel Kwun

Approximate Controllability for Semilinear Retarded Functional Differential Equations

Jin-Mun Jeong, Jong-Yeoul Park, Y. Kwun, 1999 .

APPROXIMATE CONTROLLABILITY AND CONTROLLABILITY FOR DELAY VOLTERRA SYSTEM

Jong-Yeoul Park, Y. Kwun, Jong‐Yeoul Park, 1991 .