Theory13].  ] Our contribution is a further improvement of the upper bound to O(\sqrt{\log\gamma}).
<meaning-changed> Theory13].  ] Our contribution is a further improvement of the upper bound to O(\sqrt{\log\gamma}).
Theory13]. The state of the art is an upper bound of O(\log \gamma) by Krauthgamer, Lee and Rika ] Our contribution is a further improvement of the upper bound to O(\sqrt{\log\gamma}).