Method of orthogonal projections and approximation of the spectrum of a bounded operator II
Volume 70 / 1981
                    
                    
                        Studia Mathematica 70 (1981), 1-9                    
                                        
                        DOI: 10.4064/sm-70-1-1-9                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            