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WikiPedia: Konstantin Nikolayevich (Romanov) http://data.bibliotheken.nl/id/thes/p343703661 http://mak.bn.org.pl/cgi-bin/KHW/makwww.exe?BM=1&N... https://books.google.com/books https://aleph.nkp.cz/F/?func=find-c&local_base=aut... https://catalogue.bnf.fr/ark:/12148/cb166849275 https://data.bnf.fr/ark:/12148/cb166849275 https://www.idref.fr/130352942 https://id.loc.gov/authorities/names/n92115447 https://d-nb.info/gnd/119459299 https://authority.bibsys.no/authority/rest/authori...