P. Berti et al., FINITELY ADDITIVE RADON-NIKODYM THEOREM AND CONCENTRATION FUNCTION OFA PROBABILITY WITH RESPECT TO A PROBABILITY, Proceedings of the American Mathematical Society, 114(4), 1992, pp. 1069-1078
An "exact" Radon-Nikodym theorem is obtained for a pair (m, mu) of fin
itely-additive probabilities, using a notion of concentration function
of mu with respect to m. In addition, some direct consequences of tha
t theorem are examined.