A reduced free product of lattices
Volume 73 / 1971
                    
                    
                        Fundamenta Mathematicae 73 (1971), 21-27                    
                                        
                        DOI: 10.4064/fm-73-1-21-27                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            