:
" 5 4 (160 ) 120 (48 ) 180 (72 ) 56 .
... X. .
. : " . ". : " ". . ( ): " ".
: " ?" " " .
!
. ".
. .
. .
: .
|
|
|
4.
. "" .
" "" "" "" . . ".
" " :
" 1960 90 . 30 1969 (American Association for the Advancement of Science)... . ".
. .
. . " " (Duke University):
" : " " . . .
|
|
|
" " . : . : ( ) . ".
" " :
" . ( ) . .
".
x. . .
" " "" " " . () .
:
" ( 18:912) -x. . .
. . "" ".
( " ") ; .
