@inproceedings{CDMS2007,
author = {I. Couso and  D. Dubois and  S. Montes and  L. S\'anchez},
title = {On various definitions of the variance of a fuzzy random variable},
booktitle = {5th International Symposium on Imprecise Probabilities and Their Applications({ISIPTA07})},
city = {Prague},
country = {Czech Republic},
pages = {135--144},
year = {2007}
}