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@@ -184,8 +184,10 @@ Introduction to Numerical Analysis, Second Edition
 Wen Li, Ludwig Elsner, Linzhang Lu (2000).
  
 \emph on
+\lang english
 Comparisons of spectral radii and the theorem of Stein–Rosenberg
 \emph default
+\lang spanish
  (
 \begin_inset Flex URL
 status open