equation icon  gS (x) = - 2m--U ' 'ua'ub'@ r - -2m--U '' ''ua''ub''@ r + 2m-U ' ' ua'ub' ab;g r2 aba b g radv2 aba b g adv r aba b;g 2m ' ' ' 2m '' '' 2m '' '' '' + ---Uaba'b';g'ua ubug @gu + ----Uaba''b'';gua ub + ----Uaba''b'';g''ua ub ug @gv r radv ra integral dvv ' 'a' b' '' '' a'' b'' m n + 2mVaba bu u @gu - 2mVaba b u u @gv - 2m u \~/ gVabmn(x, z)u u dt, (527)