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W. Ambrose, The system of a unimodular group. I, Trans. Amer. Math. Soc. vol. 65 (1949) pp. 27-48. MR 0028322 (10:429d)

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R. R. Bahadur, Sufficiency and statistical decision functions, Ann. Math. Statist. vol. 25 (1954) pp. 423-462. MR 0063630 (16:154g)

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P. R. Halmos and L. J. Savage, Application of the Radon-Nikodym theorem to the theory of sufficient statistics, Ann. Math. Statist, vol. 20 (1949) pp. 225-241. MR 0030730 (11:42g)

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B. Nagy, On the set of positive functions in , Ann. of Math. vol. 39 (1938) pp. 1-13.

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R. Pallu de la Barriere, Algèbras unitaries et espaces de Ambrose, C.R. Acad. Sci. Paris vol. 233 (1951) pp. 997-999. MR 0044752 (13:473a)

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T. Pitcher, Sets of positive functions in -systems, Trans. Amer. Math. Soc. vol. 77 (1954) pp. 481-489. MR 0066565 (16:597d)