\section{$B$O$8$a$K(B}

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Goody (1967, 1968), Moriyama (1974, 1975, 1976), Pollack {\it et
al}. (1979) $B$,$"$k(B. $B$b$&$R$H$D$N%0%k!<%W$OCOI=IU6a$N6-3&AX$N9=B$$rD4$Y$k(B
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$B8F$P$l$F$$$k(B. $B<g$J8&5f$H$7$F$O(B Savij\"arvi (1991), Haberle {\it et al.}
(1983) $B$,$"$k(B.

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