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diff --git a/latex_mk/sample/bibtex/Makefile b/latex_mk/sample/bibtex/Makefile
new file mode 100644
index 0000000..bebd9c0
--- /dev/null
+++ b/latex_mk/sample/bibtex/Makefile
@@ -0,0 +1,53 @@
+.PHONY: all bib-update bib-rebase body-update body-rebase rebase clean distclean
+
+CAT := cat
+CMP := cmp -s
+DIFF := diff
+PATCH := patch
+SED := sed
+
+TEXTARGETS := bibtex.pdf
+
+$(TEXTARGETS):
+
+all:
+	@$(MAKE) -s bibtex_1.pdf
+	@$(ECHO)
+	@$(MAKE) -s bibtex_2.pdf
+
+bibtex_1.pdf: rebase
+	@$(ECHO) '---------- $@: $^ ----------'
+	@$(MAKE) -s bibtex.pdf
+	@$(CP) -v bibtex.pdf $@
+
+bibtex_2.pdf: update
+	@$(ECHO) '---------- $@: $^ ----------'
+	@$(MAKE) -s bibtex.pdf
+	@$(CP) -v bibtex.pdf $@
+
+include latex.mk
+
+update: body-update bib-update
+
+rebase: body-rebase bib-rebase
+
+bib-update: bib-rebase
+	$(CAT) ref_add.bib >>ref.bib
+
+bib-rebase:
+	$(CMP) ref.bib.base ref.bib || $(CP) -v ref.bib.base ref.bib
+
+body-update: bibtex.tex.2nd.patch
+	@$(PATCH) <$<
+
+bibtex.tex.2nd.patch: rebase
+	@$(DIFF) -u bibtex.tex bibtex.tex.2nd >$@ || exit 0
+
+body-rebase:
+	$(CMP) bibtex.tex.base bibtex.tex || $(CP) -v bibtex.tex.base bibtex.tex
+
+clean: tex-clean
+
+distclean: rebase clean tex-distclean
+	$(RM) *.patch
+	$(RM) bibtex_*.pdf