@Article{178567,
     author = "Andrzej Raczyk, Helena Dobrowolska-Kaniewska",
     title = "Spatial distribution of economic entities and their classification according to technology levels in the Dolnośląskie voivodeship : (1) ",
     year =  2007,
     volume =  ,
     number =  7,
     journal =  Bulletin of Geography. Socio-Economic Series,
     pages =  s. 15-29,
    }