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Cramér, Harald. 1946. Mathematical Methods of Statistics. Princeton: Princeton University Press, page 282 (Chapter 21. The two-dimensional case). ISBN0-691-08004-6 (table of contentArchived 2016-08-16 at the Wayback Machine)
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Cramér, Harald. 1946. Mathematical Methods of Statistics. Princeton: Princeton University Press, page 282 (Chapter 21. The two-dimensional case). ISBN0-691-08004-6 (table of contentArchived 2016-08-16 at the Wayback Machine)