LyX ⇒ Chinese Characters in German Text

[Luminara]

I am using Lyx and JabRef for references. I write my thesis in
German and need to include some references in Chinese characters. I use Unicode and am able to input Chinese characters in JabRef, but when I want to include them in Lyx it doesn't seem to work. I only get a question mark for all my references in Lyx, including those which are in German. How can I fix this?