@article{102340,
      url = {http://digitallibrary.un.org/record/102340},
      title = {Comparative analysis of working time at mechanized coal  faces /},
      publisher = {UN,},
      recid = {102340},
      pages = {4 p. :},
      address = {Geneva :. 1983-06-06},
      year = {1983},
      month = {Jun},
}