From Resolution No. 268 of the Central Committee of the Communist Party of Belarus and the Council of Ministers of the BSSR «On the construction of a complex for the production of polyethylene and ethylene in Novopolotsk»
                    
                    
                        
                                                
                            
                                                                            
                                
Nat. Arch. Rep. of  Bel. Сoll. 7. Inv. 5. File. 858. Sht. 95. Script. Typescript.