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[CITE@DE[Dr. rer. nat. Claus-Peter R&#252;ckemann]] ([[Dr. rer. nat. Claus-Peter R&#252;ckemann]] 著, [TIME[2007-10-31 19:03:22 +09:00]] 版) <http://www.unics.uni-hannover.de/cpr/x/rueckemann/de/rueckemann.html>

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