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=Publications=
* [https://en.wikipedia.org/wiki/Helmut_Pfleger Helmut Pfleger], [httphttps://wwwde.schachbundchessbase.decom/personpost/player/745.html gerd-treppner-verstorben Gerd Treppner], [[Helmut Weigel]] ('''1989'''). ''[httphttps://www.schachversandniggemann.de/dcom/detailen/buecherbooks-media/11887academy-buch-fur-mephisto.html Academy, Buch für Mephisto ... ]''. [[Schachversand Niggemann]] (German)
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