@ARTICLE{Huang-1605-03507,
 author = "R. Adam, N. Aghanim, M. Ashdown and others",
 title = "{Planck intermediate results. XLVII. Planck constraints on reionization history}",
 journal = "{A&A}",
 year = {2016},
 month = {Dec},
 date = {12},
 volume = {596},
 pages = {A108},
 doi = {10.1051/0004-6361/201628897},
 archivePrefix = {arXiv},
 eprint = {1605.03507}
}