Aktuelles aus Stralsund(in de). blog.pommerscher-greif.de / Pommerscher Greif e.V. (2013-02-14). Retrieved on 2013-02-14.
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Please specify if terms of license are complied with! (-)(in es). fundacionvazquezsantos.org / Fundación Dr. Ildefonso Vázquez Santos, Biblio-Red, A. C. (2013-02-14). Retrieved on 2013-02-14. No name, no licence