Raytchev T., Donov D., Paskaleva K., Hubenov G., SokoĊowska Z., Hajnos M.:         
    
        Impact of the analytical treatments on the crystalo-chemical characteristics of the mineral part of the soil adsorbent. (2005 r.)   
        
        Institute of Agrophyscis PAS, Lublin, "Physicochemical character of soil adsorbent" 
                
                
            2005, 60-72