I followed advice in "How to write greek letters in BibTeX entry?". I produced a correct bibliography item based on using \textalpha in the relevant BibTeX item. (I use LyX Version 2.2.1 and I use JabRef 4.1 for Windows 10.) Regarding my use of \textLambda (in a different BibTeX item), LyX produced (in my bibliography) a lower-case lambda . How can I get LyX to produce upper-case Greek letters in my document's bibliography?