@manuascript {625442,
	title = {On Adaptive Estimation of Nonparametric Functionals},
	year = {2021},
	url = {https://arxiv.org/pdf/1608.01364.pdf},
	author = {Liu, Lin and Rajarshi Mukherjee and Robins, James M. and Tchetgen, Eric Tchetgen}
}
