@inproceedings{sgem2019s18099,
  title = {THE COMPOSITION OF SECONDARY TIN AND ITS HARDNESS},
  author = {Peter Futáš},
  booktitle = {SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; 19th International Multidisciplinary Scientific GeoConference SGEM2019, Energy and Clean Technologies},
  year = {2019},
  pages = {779-784},
  publisher = {STEF92 Technology},
  doi = {10.5593/sgem2019/4.1/s18.099}
}