@article {sun2020summarize,
	title = {Summarize, outline, and elaborate: Long-text generation via hierarchical supervision from extractive summaries},
	journal = {arXiv preprint arXiv:2010.07074},
	year = {2020},
	author = {Sun, Xiaofei and Chun Fan and Sun, Zijun and Meng, Yuxian and Wu, Fei and Li, Jiwei}
}
