Ivan A. Levitskii,                                                                    Svetlana E. Baranceva,                                                                    Anna I. Pozniak                                                            
                                                
                        Abstract  594 |
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                                                                                                                                        | DOI 
                            
                                https://doi.org/10.3846/2029882X.2013.777017
                            
                                                                            
                                
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