?. ?ss???s?-??t?, ?. ?. ?s?r??-t??t-t??-@bullet?-?-??r-??????-?-r-?s-?-?rt?r???-??t???-?-s?-t??, ?. ?. , ?. , ?. T?? et al., 11 t? R 8 ??r??? 8000 s ??t? ? ??t????? ??r??? ???t???? 1500 2500 s? ?t t???t??? t??t t?? t?? ???????rs ?r? st??? ?r?s??t? ?t ?s ????rt??t t? ??s?r?? t??t ???? ???????r ?s r??r?s??t?? ?? ???? ??? s???? t??t r??r?s??ts t?? ???r??? ??ss???s ?rr???? ?? t?? ??r???? ???? ???? ????? ??ss???s ?r? s??t t?? s???? ?s ? ??tt?? ?????r t??? 0??s ??r ????r?t?? ????????t ?t ?? t?? s????t ??? s??rt s???? ??????s? q??t? ?s ??? ?? ? ?s ??t t? ? ? ???? ??????r? ??r ???? t??s? ??????s ??st t?? ???? ??r???? ???? s? ??? ??s? t??r? ?s ?? ?????r????? t? t?? ???? ?rr???? r?t?? ???s ????s t??t ??r ????r?t?? ?s ??r? ????r?t? t? ??t??t t??s? ??????s? ???????? t?? q????t? ?? t?? r?s??ts ?? t?? ??? ?s ?????? s??s?t???, 1900.