@article{30301,
      author       = "Kowalski, Andrzej and Wrona, Robert and Borkowski, Zbigniew
                      and Polskie Zakłady Optyczne",
      title        = "Spodarka poziomujaca  ",
      year         = "1979",
      note         = "1 list, G 01 C 15/00., 3.6.1977, 8.5.1978",
}