On the control of linear periodic time lag systems
Volume 32 / 1969
                    
                    
                        Studia Mathematica 32 (1969), 149-152                    
                                        
                        DOI: 10.4064/sm-32-2-149-152                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            