$1!K?!KB!7`'Wb'\S'V5!>4'Z-(B. $1!_V!3'!IV'Wl'V5!>4!X4s - $1!Cs'D&!82!4x'Q[(B; $1!Cs!8r!Cu'Q['[Ms ($1!0&!GW!O(':`!@,EWF!3K!JH!Nas, 1987)
Keywords: $1'V5!>4s