First-Order Averaging Principles for Maps with Applications to Accelerator Beam Dynamics. - H. Scott Dumas; James A. Ellison; Mathias Vogt (SIAM J. Appl. Dyn. Syst., 2004)

Rapid evaluation of two-dimensional retarded time integrals. - D. A. Bizzozero; James A. Ellison; K. Heinemann; Stephen R. Lau (J. Comput. Appl. Math., 2017)