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Johannes Kepler Johann Sebastian Bach Johan Cruyff Johan Cruyff Arena Johann Wolfgang von Goethe Johannes Brahms Johannes Gutenberg Johan Bakayoko Johannesburg Johann ZarcoTài liệu tham khảo
WikiPedia: Johannes_Kepler http://www.univie.ac.at/hwastro/ http://austrian-mint.at/silbermuenzen?l=en&muenzeS... http://www.lapresse.ca/cinema/cinema-quebecois/ent... http://www.astronomycast.com/history/ep-189-johann... http://www.britannica.com/EBchecked/topic/315225 http://www.calderon-online.com/trabajos/kepler/har... http://books.google.com/books?id=KR2EtBnmcRYC&pg=P... http://books.google.com/books?id=dTMAAAAAQAAJ&pg=P... http://books.google.com/books?id=gzMAAAAAQAAJ&pg=P... http://books.google.com/books?id=m9xHAAAAIAAJ&