John Harding Massimo Marinacci Nhu T. Nguyen Tonghui Wang Local Radon-Nikodym Derivatives of Set Functions. 379-394 1997 5 International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems 3 http://dx.doi.org/10.1142/S0218488597000270 db/journals/ijufks/ijufks5.html#HardingMNW97