Smartphone OS Market Share. www.idc.com. [2023-07-13]. (原始内容存档于2016-12-08). Gartner Says Tablet Sales Continue to Be Slow in 2015. 2015-01-05 [2015-03-06]
vaccine-preventable diseases. 9th. Public Health Foundation. January 2006: 171–192. Gartner LM, Morton J, Lawrence RA, Naylor AJ, O'Hare D, Schanler RJ, Eidelman AI