Galina Ševčenko,                                                                    Leonas Ustinovičius,                                                                    Robert Balcevič                                                            
                                                
                        Abstract  647 |
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                                538
                                                                                                                                        | DOI 
                            
                                https://doi.org/10.3846/13928619.2004.9637655
                            
                                                                            
                                
                                Page 47-56
                            
                        
                                           
                                        
                                    
  

