\BOOKMARK [1][-]{section.1}{Introduction}{}% 1
\BOOKMARK [1][-]{section.2}{Preliminary results}{}% 2
\BOOKMARK [1][-]{section.3}{Estimation of the main term}{}% 3
\BOOKMARK [1][-]{section.4}{Estimation of the error term}{}% 4
\BOOKMARK [1][-]{section.5}{Final remarks}{}% 5
\BOOKMARK [1][-]{section.6}{Acknowledgments}{}% 6