00000nz  a2200000n  4500
001  KSH2006003397
005  20060510011307
008  060510 n azknn|abn          |a a|a    | 
150  ▼a영제약 조건[零制約條件]▲
450  ▼wr▼i영어▼azero restriction on coefficient▲
550  ▼a구조 방정식[構造方程式]▲
550  ▼a식별 문제[識別問題]▲