Editorial: In memoriam—Valentin S. (Valya) Afraimovich (2 April 1945-21 February 2018) Bunimovich, Leonid ; Neishtadt, Anatoly ; Kurths, Jürgen Abstract Publication: Chaos Pub Date: April 2018 DOI: 10.1063/1.5034461 Bibcode: 2018Chaos..28d0401B