source: The quark model was independently proposed by physicists Murray Gell-Mann and George Zweig in 1964.
target: The quark model was proposed separately by two physicists Murray Gell-Mann, and George Zweig, in 1964.
references: The quark model was proposed separately by two physicists Murray Gell-Mann, and George Zweig, in 1964. The quark model was made by physicists Murray Gell-Mann and George Zweig in 1964. In 1964, the quark model was suggested independantly by physicists Murray Gell-Mann and George Zweig. Physicists Murray Gell-Mann and George Zweig proposed the quark model in 1964. Physicists Murray Gell-Mann and George Zweig proposed the quark model. In 1964, physicists Murray Gell-Mann and George Zweig presented the quark model. The quark model was seperately talked about by physicists Murray Gell-Mann and George Zweig. In 1964 Murray Gell-Mann and George Zweig each proposed the quark model, separately from each other. The quark model was proposed by physicists Murray Gell-Mann and George Zweig in 1964. The quark model was also proposed by Murray Gell-Mann and George Zweig.