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1955 • 3,424 citations

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1963 • 1,434 citations

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1960 • 1,428 citations

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1951 • 729 citations

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1956 • 648 citations

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1962 • 621 citations

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1960 • 422 citations

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1958 • 245 citations

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1962 • 182 citations

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1962 • 181 citations

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1961 • 152 citations

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1963 • 79 citations

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1960 • 78 citations

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1958 • 64 citations

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1963 • 62 citations

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1968 • 61 citations

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1963 • 61 citations

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1968 • 56 citations

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1964 • 48 citations

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1961 • 47 citations

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1961 • 34 citations

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1963 • 33 citations

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1965 • 31 citations

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1965 • 31 citations

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1963 • 26 citations

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1958 • 25 citations

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1957 • 19 citations

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