@Article{488498,
     author = "Wioletta Grzenda, Michał K. Buczyński",
     title = "Estimation of employee turnover with competing risks models",
     year =  2015,
     volume =  15(23),
     number =  2,
     journal =  Folia Oeconomica Stetinensia,
     pages =  s. 53-65,
    }