Equation Icon  + oo 0 sum [ - 1 ] w n = @L r NL(u) , l=0 (41) + sum oo [ ] sum + oo { [ ] [ ]} win = @iL r-1PL(u) + @L -1 r- 1QiL -1(u) + eiab@aL-1 r-1RbL- 1(u) . l=0 l=1