@Article{513053,
     author = "Leszek Gracz",
     title = "The evaluation of the use of mobile apps by citizens of Polish voivodeships cities",
     year =  2015,
     volume =  40,
     number =  ,
     journal =  Problemy Zarządzania, Finansów i Marketingu,
     pages =  s. 135-146,
    }