E:


299 , 34200 [ Rail ea 1982 ].

293 , 71% [ Fung ea 1986 , Hussain ea 1988 ].

, , . [ Weisgraher ea 1985 ] , .

, , - 141-155. 143 , 144 150 , , [ Dyer ea 1988 , Dyer ea 1991 ].

, . 18 . .

22 . . , , , - [ Jonas ea 1993 ].