F E Close 1979 London and New York: Academic xiii + 481 pp price £26.40 In recent years, great advances have taken place in elementary particle physics, and quarks and leptons now seem to be the fundamental entities. There are different types of quark (up, down, strange, charm ...) and these are the basic building blocks of all strongly interacting particles (hadrons).
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A. D. Martin (1979) studied this question.