WHO (2019) Recommended Composition of Influenza Virus Vaccines for Use in the 2019-2020 Northern Hemisphere Influenza Season.
https://www.who.int/influenza/vaccines/virus/recommendations/2019_20_north/en/

has been cited by the following article:

• TITLE: Flu Epidemics Force versus Virus Type in USA

  AUTHORS: Edgar Pereira, Cecília Rosa

  KEYWORDS: Influenza Force, Virus Types, Age Groups, Estimates, Laboratory Tests

  JOURNAL NAME: Open Journal of Epidemiology, Vol.10 No.2, May 7, 2020

  ABSTRACT: We estimate the influenza force according to the virus type in the USA (United States of America) for the season 2010/11 to 2019/20. For these we use the data available from CDC (Centers for Disease Control and Prevention) related to Public Health Laboratory Virologic Age Surveillance and The Burden Estimates presented by CDC yearly.