@Article{577719,
     author = "Jan Krotký, Pavla Karpíškova, Jan Král",
     title = "The Use of Non-System Components of Construction Sets ",
     year =  2017,
     volume =  ,
     number =  3(21),
     journal =  Edukacja - Technika - Informatyka,
     pages =  s. 74-81,
    }