File:Yuri Linnik (photo).jpg

Summary
Photo of Yuri Linnik from the official web site of the Russian Academy of Sciences: http://www.ras.ru/win/db/show_per.asp?P=.id-51108.ln-en

If the photo was published in Soviet Union prior to 1973, it may also be in the public domain.

Fair use rationale

 * The subject is dead and no free replaceable image can be produced. (WP:NFC#1).
 * The image is provided at a low resolution to avoid hindering its commercial use by the copyright holder. (WP:NFC#2 and WP:NFC#3).
 * It was previously published at the official web site of the Russian Academy of Sciences (WP:NFC#4).
 * As a well-composed photographic portrait, it is an accurate representation of the subject (WP:NFC#5).
 * A non-free fair use tag is provided, as is a link to the site from which the image was taken and a link to the Wikipedia articles in which fair use is claimed (WP:NFC#6 and #10).
 * It is used in Yuri Linnik to illustrate a biography of its subject (WP:NFC#7 and #9), and enhances the reader's understanding of the subject (WP:NFC#8).