\BOOKMARK [1][-]{section.1}{1. Introduction}{}% 1
\BOOKMARK [1][-]{section.2}{2. Geometry of quartic double fourfolds}{}% 2
\BOOKMARK [1][-]{section.3}{3. Singularities of the special fiber}{}% 3
\BOOKMARK [1][-]{section.4}{4. Proof of the Theorem 1}{}% 4
\BOOKMARK [1][-]{section*.10}{References}{}% 5