By Mendelson, Elliott, Rosen, Kenneth H.
By Roth, Alvin
By Beaumont, GP
By Open University Course Team
By Hirschfeld, J. W. P.
By Lamb, J. D.
By Walker, K.
By Riordan, John
By Gurney, Kevin
By Ian Anderson
By Gross, Jonathan L., Yellen, Jay
By Petkovsek, Marko, Wilf, Herbert S, Zeilberger, Doron
By Ore, Oystein
By Gelfand, Israel M., Kapranov, Mikhail, Zelevinsky, Andrei
By Watkins, John J.
By Golomb, Solomon W., Lushbaugh, Warren
By Filiol, Eric
By Chartrand, Gary, Lesniak, Linda, Zhang, Ping
By Slomson, A., Alan
By Ivanov, O. A., Burns, R.G.
By Lovasz, L., Pelikan, J., Vesztergombi, K.
By Albert, Jim
By Graham, Ronald, Wilson, Robin, Watkins, John J.
By Biggs, Norman L.
By Balakrishnan, V., V. K.
By Welsh, D. J. A.
By Eisenbud, David, Grayson, Daniel R., Stillman, Mike, Sturmfels, Bernd
By Stanley, Richard P., Fomin, Sergey
By Magnus, Wilhelm, etc.