On the Diophantine equation $(x^2\pm C)(y^2\pm D)=z^4$
Volume 144 / 2010
                    
                    
                        Acta Arithmetica 144 (2010), 69-95                    
                                        
                        MSC: 11D25, 11B39.                    
                                        
                        DOI: 10.4064/aa144-1-5                    
                                    
                                                                
                             
             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                             
                                                         
                                                            