by Zerger, Ted, Deutsch, Emeric, Chao, Wu Wei, Binz, J. C., Pirvănescu, Florin S., Andreoli, Michael, Hoehn, Larry, Callan, David, Lau, Kee-Wai, Stahl, Saul, Schindler, Volkhard, Harminc, Matús̆, Soták, Roman, Abad, Jack C., Lord, Nick, Schmeichel, Edward
Published in Mathematics magazine (01.06.1997)