@article{Esponda20092456, title = "Surveys with negative questions for sensitive items", journal = "Statistics & Probability Letters", volume = "79", number = "24", pages = "2456 - 2461", year = "2009", note = "", issn = "0167-7152", doi = "DOI: 10.1016/j.spl.2009.08.019", url = "http://www.sciencedirect.com/science/article/B6V1D-4X54JJG-2/2/8ba2397c0ae8c1585e0b0caf5750f300", author = "Fernando Esponda and Victor M. Guerrero" }