Note down how to get completion for cross-references with AUCTeX

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+* Completion for cross-references
+To integrate AUCTeX with reftex and get completion for ~\cite~
+(bibliography) and ~\ref~ (intra-document labels):
+#+begin_src elisp
+;; In init file:
+(put 'TeX-auto-save 'safe-local-variable 'booleanp)
+(put 'TeX-parse-self 'safe-local-variable 'booleanp)
+(add-hook 'LaTeX-mode-hook 'turn-on-reftex)
+(setq reftex-plug-into-AUCTeX t)
+(setq reftex-label-illegal-re "[^-a-zA-Z0-9_+=:;,./]")  ; Allow slashes.
+(setq TeX-auto-local ".auctex")
+
+;; Top-level .dir-locals.el:
+((latex-mode
+  . ((TeX-auto-save . t)
+     (TeX-parse-self . t)))
+ (bibtex-mode
+  . ((TeX-auto-save . t)
+     (TeX-parse-self . t))))
+
+;; .dir-locals.el files in subfolders:
+((latex-mode
+  . ((TeX-master . "../path/to/main.tex"))))
+#+end_src