On normed semialgebras
Volume 21 / 1961
                    
                    
                        Studia Mathematica 21 (1961), 45-54                    
                                        
                        DOI: 10.4064/sm-21-1-45-54                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            