A Further Study of the Luminosity‐dependent Cyclotron Resonance Energies of the Binary X‐Ray Pulsar 4U 0115+63 with the Rossi X‐Ray Timing Explorer
                         
                    
                    
                    
                        - Authors: M. Nakajima, T. Mihara, K. Makishima, and H. Niko
                        Nakajima  et al. 
                        2006 The Astrophysical Journal 646
                         1125.