@article{244135,
      url = {http://digitallibrary.un.org/record/244135},
      title = {Geo-dynamic zoning as one of the basic solutions for  rational extraction of coal deposits, including safety and  ecological aspects /},
      publisher = {UN,},
      recid = {244135},
      pages = {3 p.},
      address = {Geneva :. 1993-06-08},
      year = {1993},
      month = {Jun},
}