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    7. Citation data were determined using the Dialog service to access ISI Social Science Citations. Individual articles were located, and citations to these articles were analyzed by year of publication. Data were determined for 1997-1999 inclusive by simple addition. Average number of cites per year was figured beginning in the year of publication or 1972, whichever is later, through the end of 1999, then dividing that total number by the number of years since publication or 1972, whichever is later. 1972 is the earliest year of data provided by ISI in the version of the database we consulted.

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