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Robert Oppenheimer Robert Lewandowski Roberto Carlos Robert Downey Jr. Roberto Baggio Roberto Mancini Robert Pattinson Robert Pirès Roberto Firmino Robert SchumannTài liệu tham khảo
WikiPedia: Robert_Simson http://agutie.homestead.com/files/simsonangletheor... http://agutie.homestead.com/files/simsontheorem1.h... http://www.cut-the-knot.org/ctk/SimsonLine.shtml http://www-history.mcs.st-and.ac.uk/~history/Mathe...