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-rw-r--r--buch/chapters/050-differential/Makefile.inc2
1 files changed, 1 insertions, 1 deletions
diff --git a/buch/chapters/050-differential/Makefile.inc b/buch/chapters/050-differential/Makefile.inc
index b72a275..7151c07 100644
--- a/buch/chapters/050-differential/Makefile.inc
+++ b/buch/chapters/050-differential/Makefile.inc
@@ -4,7 +4,7 @@
# (c) 2021 Prof Dr Andreas Müller, OST Ostschweizer Fachhochschule
#
-CHAPTERFILES = $(CHAPTERFILES) \
+CHAPTERFILES += \
chapters/050-differential/beispiele.tex \
chapters/050-differential/potenzreihenmethode.tex \
chapters/050-differential/bessel.tex \