diff -r 1e31ddcab458 -r 4c275405faae src/Doc/Codegen/Evaluation.thy
--- a/src/Doc/Codegen/Evaluation.thy	Sun Jan 15 16:28:03 2023 +0100
+++ b/src/Doc/Codegen/Evaluation.thy	Sun Jan 15 18:30:18 2023 +0100
@@ -57,7 +57,7 @@
 subsubsection \<open>Normalization by evaluation (\<open>nbe\<close>)\<close>
 
 text \<open>
-  Normalization by evaluation @{cite "Aehlig-Haftmann-Nipkow:2008:nbe"}
+  Normalization by evaluation \<^cite>\<open>"Aehlig-Haftmann-Nipkow:2008:nbe"\<close>
   provides a comparably fast partially symbolic evaluation which
   permits also normalization of functions and uninterpreted symbols;
   the stack of code to be trusted is considerable.