Siyuan Jing and  Kun She,  Heterogeneous Attribute Reduction in Noisy System based on a Generalized Neighborhood Rough Sets Model.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    March 2011, vol. 51(3). 351 - 356
    [viewed 11 April 2021]. Available from: https://publications.waset.org/pdf/7597.