Vaccine
Volume 35, Issue 43, Pages 5731-5946 (13 October 2017)
http://www.sciencedirect.com/science/journal/0264410X/35/43?sdc=1
WHO position on the use of fractional doses – June 2017, addendum to vaccines and vaccination against yellow fever WHO: Position paper – June 2013
Pages 5751-5752
World Health Organization