4.71%
Beizer
50%
Beizer
Beizer
85% Endres1975
97
( Curits , Krasner Iscoe1988)
95% 2%
l% (Brown sampaon19733,Ostrand Weyuker1984)
36% Weiss1975
1987 18% Card 1989.
4% Endre1 975
Gerald Weinberg
16 9 2.4 5
Beizer 16.19% 19%
1990
41%
Youngs1 974
3 Gould1975
85% 15%
1% Beizer 20 %
80%