By Karl-G. Grosse-Erdmann, Alfred Peris Manguillot
By Yves Coudene, Reinie Erne
By Jurgen Jost
By Viorel Barbu
By Mohammed Al-Gwaiz
By David F. Griffiths, Desmond J. Higham
By George A. Articolo (Rutgers University, New Brunswick, NJ, USA)
By Steven Holzner
By Martha L. Abell, James P. Braselton
By M. Tenenbaum
By Dexter J Booth, K. a Stroud
By Augusto Visintin
By C. Henry Edwards, David E. Penney
By Stanislaw H. Zak (Professor Electrical and Computer Engineering, Professor Electrical and Computer Engineering, Purdue University)
By William E. Boyce, Richard C. DiPrima