@misc {IOPORT.70813793,
    author       = {Wygralak, Maciej},
    title        = {Hesitation degrees as the size of ignorance combined with fuzziness},
    howpublished = {IPMU (1), 629-636 (2010).},
    year         = {2010},
    doi          = {10.1007/978-3-642-14055-6_66},
    identifier   = {70813793},
}