$1!:v'2>!0d(B. $1'Qm!Os(B23$1!Cds - $1!:v'2>!0d'_K'Xm!Nas ($1!:v'2>!0d'_K'Xm!Nas, 1998)
Keywords: $1!O1!FM!5#'2X!FM(B--$1'U<'2Xs