Original: Zezong , Xi , '' The Discovery of Jupiter 's Satellite Made by Gan De 2000 years Before Galileo , '' Chinese Physics 2 ( 3 ) ( 1982 ) : 664 -- 67 .
Simplified: Xi Zezong , '' The Discovery of Jupiter 's Satellite Made by Gan De 2000 years Before Galileo , '' Chinese Physics 2 ( 3 ) ( 1982 ) : 664-67 .