@inbook {1615,
	title = {Future Directions of Query Understanding},
	booktitle = {Query Understanding for Search Engines},
	year = {2020},
	pages = {205{\textendash}224},
	publisher = {Springer},
	organization = {Springer},
	author = {Carmel, David and Chang, Yi and Deng, Hongbo and Nie, Jian-Yun}
}
