@article {tong2015quantification,
	title = {Quantification of Surface Ligands on NaYF4 Nanoparticles by Three Independent Analytical Techniques},
	journal = {Chem. Mater.},
	volume = {27},
	number = {13},
	year = {2015},
	pages = {4899{\textendash}4910},
	doi = {10.1021/acs.chemmater.5b02190},
	author = {L. Tong and E. Lu and J. Pichaandi and P. Cao and M. Nitz and M. A. Winnik*}
}
