| 
            
                S. H. Kim, G. K. Shenoy, and P. J. Viccaro, “Spectral Character of Optimized Undulator Insertion Devices for the Synchrotron X-Ray Source at Argonne”, in Proc. 12th Particle Accelerator Conf. (PAC'87), Washington D.C., USA, Mar. 1987, pp. 473-476. | 
                                
            
             | 
            
                P. J. Viccaro and G. K. Shenoy, “Undulator Tunability and Synchrotron Ring-Energy”, in Proc. 12th Particle Accelerator Conf. (PAC'87), Washington D.C., USA, Mar. 1987, pp. 485-488. |