@inproceedings{conantopological,
title={Topological QFT for Calabi-Yau threefolds and G2-manifolds},
author={Conan Leung},
url={http://archive.ymsc.tsinghua.edu.cn/pacm_paperurl/20160831142738414550574},
booktitle={Surveys in differential geometry},
volume={8},
pages={257-267},
}